Court Jester Goby

Last time this was in stock, it was £35.00

Court Jester Goby, Amblygobius rainfordi

  • Common Name: Court Jester Goby
  • Latin Name: Amblygobius rainfordi
  • Synonyms: Rainford’s Goby
  • Distribution: Native to the Western Pacific Ocean, spanning Indonesia, the Philippines, Bali, and the Solomon Islands.
  • Max Size: Typically grows up to 3 inches (7.6 cm).
  • Temperature Range: 76-82°F (24-28°C).
  • pH Range: 8.1-8.4.
  • KH Range: 8-12 dKH.
  • Care Level: Moderate
  • Lighting Preference: They adapt well to various lighting conditions in reef tanks.
  • Preferred Food: Carnivorous; diet includes small invertebrates, crustaceans, and zooplankton.
  • Behaviour: Peaceful, burrows in the sand, and is a good addition to a peaceful community tank.
  • Suitable for Reef Tanks: Yes, they are reef-safe.
  • Interesting Facts: Court Jester Gobies display intricate courtship and spawning behaviours in the wild,

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Free shipping on orders over £50 (may exclude some aquariums)  Geographical restrictions may apply

LIVESTOCK = Fish, Critters and Corals

Minimum order value £30Delivery charge £19.99. Delivery days Are Varied At The Moment.  We will contact you to confirm your delivery day. Some geographical restrictions apply See shipping

Aquarium Plants: Are shipped the same as and can be mixed with Dry goods *Free shipping on orders over £50 or £6.99 for orders under £50. Some geographical restrictions may apply.

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The Court Jester Goby, Amblygobius rainfordi, also known as Rainford’s Goby, is a charming and petite marine fish. It reaches a maximum size of about 3 inches (7.6 cm) and boasts vibrant, eye-catching colours. Its body is predominantly pale hues of blue and green, adorned with intricate orange horizontal stripes, resembling a traditional court jester’s outfit.


Belonging to the Gobiidae family, the Court Jester Goby is part of the Amblygobius genus. Amblygobius fishes are known for their elongated bodies and distinctive dorsal fin patterns. The genus Amblygobius is closely related to other goby genera, such as Valenciennea and Stonogobiops. The species name “rainfordi” pays tribute to the Australian ichthyologist, John Ernest Randall.

Natural Habitat:

Court Jester Gobies are typically found in the tropical reefs of the Indo-Pacific region. Their habitat is characterized by crystal-clear, warm waters teeming with coral formations. They prefer sheltered areas like lagoons, reef flats, and shallow coastal zones. These gobies often inhabit sand flats adjacent to coral formations, where they create burrows in the substrate for protection and breeding.

Keeping Court Jester Gobies Healthy:

The Court Jester Goby is considered a great choice for aquarists of all experience levels. Their care level is relatively low, making them ideal for beginners. Maintain a temperature range of 76-82°F (24-28°C) in the tank. Keep the pH level around 8.1-8.4 and maintain specific gravity between 1.020-1.025. Regular water changes and good filtration are essential for their well-being.

Special Requirements and Feeding:

Court Jester Gobies are primarily carnivorous and thrive on a diet of small invertebrates, crustaceans, and zooplankton. Offer them a balanced diet of frozen or live foods, such as brine shrimp, Mysis shrimp, and copepods. They can also benefit from high-quality pellet or flake foods formulated for marine carnivores. Ensure they are fed several times a day in smaller portions to mimic their natural feeding patterns.

How Many Should I Keep:

These gobies are peaceful and can be kept singly or in pairs. In larger tanks, you can consider small groups, but provide enough hiding places and space for each individual. A 20-gallon (75.7 litres) tank is sufficient for a single goby, with an additional 10 gallons (37.9 litres) for each additional fish.

Lighting Preference:

Court Jester Gobies do not have specific lighting requirements. They adapt well to a variety of lighting conditions in a reef tank, from low to moderate intensity. However, providing some shaded areas using rockwork or coral formations is advisable to allow them to choose their preferred lighting spots.

Suitable Tank Mates:

These gobies are generally peaceful and can coexist with a wide range of reef-safe tank mates. Ideal tank mates include other non-aggressive species like clownfish, dartfish, and blennies. Be cautious with larger, more aggressive species that may intimidate or outcompete them for food. Avoid keeping them with predatory fish that may view gobies as potential prey.

Reproduction in the Wild:

Court Jester Gobies follow a distinct courtship and spawning ritual. The process usually begins with a male goby selecting and excavating a burrow in the sandy substrate. This burrow serves as the central stage for their reproductive activities. It is carefully constructed, often near the protective cover of coral formations or rocks, providing a safe environment for the forthcoming spawning event.

Breeding Amblygobius rainfordi:

  1. Set up: Breeding Court Jester Gobies in captivity requires meticulous planning. A dedicated breeding tank, approximately 10-20 gallons (37.9-75.7 litres) in size, should be set up. The tank should replicate the natural habitat of these gobies, complete with sand substrate, live rock, and a stable temperature of 78-80°F (25.6-26.7°C).
  2. Courtship/Spawning: Court Jester Gobies exhibit distinctive courtship and spawning behaviours. During courtship, the male goby begins digging a burrow in the sand and defends it from other fish. When a female approaches, the male performs an elaborate courtship dance, characterized by fin displays and rapid darting movements. Once the female is receptive, she enters the burrow, and the pair engages in spawning.Spawning involves the female laying adhesive eggs inside the burrow, while the male fertilizes them. The male goby diligently guards the eggs, protecting them from potential threats. The incubation period typically lasts 8-10 days, depending on environmental conditions.
  3. Rearing: After hatching, the juvenile gobies emerge from the burrow and are carried away by ocean currents. Replicating this natural process in a home aquarium can be challenging. To rear the fry, provide a separate rearing tank with suitable food, such as rotifers and copepods, to support the early stages of their development. As they grow, transition them to larger foods like brine shrimp nauplii.

Sexual Dimorphism:

Court Jester Gobies exhibit minimal sexual dimorphism. Males and females share similar colouration and body shapes. Distinguishing between sexes can be challenging, with subtle differences in fin size and body shape. Males tend to have slightly larger dorsal fins and may be more robust than females.


These striking gobies are native to the Western Pacific Ocean, with their natural distribution spanning from Indonesia, including the Java Sea, Bali, and the Philippines, to the Solomon Islands. They can be found in a variety of habitats, from shallow coastal zones to deeper lagoon areas with clear, warm waters, abundant coral formations, and sandy substrates.


The Court Jester Goby, scientifically known as Amblygobius rainfordi, is a captivating marine species renowned for its vibrant colouration and fascinating reproductive behaviours. Breeding this species in captivity involves careful tank setup, courtship rituals, and dedicated rearing efforts. In the wild, they contribute to the biodiversity of tropical marine ecosystems, inhabiting a wide range of habitats in the Western Pacific Ocean. Minimal sexual dimorphism makes distinguishing between males and females a challenge, but their unique courtship and spawning behaviours are a testament to the beauty of nature.


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Dry Goods Delivery.

The store has provided information regarding their order dispatch and estimated delivery times. Here are the key details:

  1. Dispatch Timeframe: Orders placed before 2pm will be dispatched on the same day. Orders placed after 2pm will be dispatched on the next working day.
  2. Delivery Date and Time Guarantee: While the store aims to dispatch orders promptly, they cannot guarantee a specific delivery date and time. As the delivery process relies on couriers, there may be factors beyond their control that could affect the delivery timeframe.
  3. 1st Class Mail: For orders sent via 1st Class mail, the aim is to have them delivered on the next working day after dispatch.
  4. 2nd Class Mail: Orders sent via 2nd Class mail typically take approximately 2-3 working days for delivery after dispatch.
  5. APC Next Day Delivery: APC Next Day delivery is available for UK mainland postcodes. It is usually delivered on the next working day after dispatch. However, please note that items being delivered to more remote areas may require additional time for delivery.

It’s important to keep in mind that while the store strives to provide efficient delivery services, unforeseen circumstances or external factors could potentially impact delivery times. For further details or specific inquiries about delivery, customers should refer to the store’s terms and conditions or contact the store directly.

Livestock Delivery.

The store maintains specific policies regarding the delivery of livestock. Here are the key points:

  1. Licensed Livestock Courier: The store exclusively uses a licensed livestock courier for shipping fish and coral. This approach is chosen to ensure responsible and ethical transportation of the livestock.
  2. Livestock Shipping Fee: The livestock shipping fee charged to customers of £19.99 does not cover the true cost, and therefore, there is a minimum spend requirement of £30.00 before the option for livestock shipping becomes available.
  3. Pre-Arranged Delivery: The store never ships livestock without first arranging a suitable delivery day. Before dispatching the livestock, the store must confirm the agreed-upon delivery day with the customer.
  4. Saturday Delivery Confirmation: Customers who choose Saturday delivery must have their availability confirmed for the upcoming Saturday before the store sends out the livestock. This confirmation ensures that the livestock can be received promptly.
  5. Failure to wait for livestock: Not waiting for livestock, even if there is a reasonable delay, or cancelling an order after it has been dispatched will lead to you incurring charges for an emergency return to the base. Additionally, any losses of livestock will also be charged to you. Please be aware that the items you are ordering are living creatures – livestock. We kindly ask that you refrain from ordering livestock if you are unable to accommodate the possibility of a delayed delivery.

    These terms and conditions are a fundamental aspect of our policy. Our primary goal is to dissuade individuals who could react negatively to a delayed delivery and subsequently request order cancellations. It is of utmost importance to underscore that your order pertains to living creatures, not mere inanimate objects. In the event of an occasional delay, it is crucial that you respond in a rational and responsible manner, taking into account the welfare of the livestock. We kindly request that you refrain from placing an order for livestock if you tend to react strongly to such situations. By proceeding with the order of livestock, you indicate your acceptance and agreement to abide by these specified terms and conditions.

  6. Signature Requirement: Livestock deliveries require a signature upon receipt and cannot be left in a safe location. This precaution ensures proper handling and the well-being of the livestock.
  7. Geographic Restrictions: The courier has strict geographic restrictions for livestock deliveries. Unfortunately, deliveries to Northern Ireland, Republic of Ireland, Isle of Man, Isles of Scilly, Channel Islands, and certain Scottish offshore postcodes may not be possible. Customers are encouraged to contact the store via email to confirm if livestock delivery is available in their area.
  8. Minimum Order Value and Order Cancellations: The store has a minimum order value of £30 for livestock shipping. Additionally, the store reserves the right to cancel orders that are deemed high-risk or involve a high number of single tropical freshwater fish species.

It is essential for customers to familiarize themselves with these policies before making a purchase. For more detailed information or specific inquiries, customers should consult the store’s terms and conditions or reach out to the store directly for clarification.

Livestock Geographical Exemptions.

The store has specific geographical exemptions for livestock deliveries. Here is a list of the areas and postcodes where livestock delivery is not available:

  1. Islands: Livestock cannot be delivered to the Shetlands, Channel Islands, and Isle of Man.
  2. Postcodes: Livestock delivery is not available to the following postcodes:
  • AB30 to AB39, AB41 to AB45, AB51 to AB56
  • DD8 to DD10
  • BT all
  • DG3 to DG9, DG12 to DG14
  • KA18 to KA19, KA26, KA29 to KA30
  • HS all
  • IM all
  • JE all
  • ZE all
  • KW15 to KW17
  • TD9
  • FK17 to FK21
  • GY all
  • KA26, to KA28
  • PA20 to PA38, PA41 to PA49, PA60 to PA61, PA76 to PA78
  • TR21, to TR25
  • PH3 to PH26, PH30 to PH44
  • IV all

Customers residing in these areas should be aware that livestock delivery is not available to their location.

We can ship livestock to the Isle of Wight, this area is subject to a surcharge.

For further information or specific inquiries about livestock delivery to a particular area, customers are advised to contact the store directly for clarification.


According to the store’s policy, customers have the right to cancel an order within 14 working days of receiving the goods. To initiate the cancellation, the goods must be returned to the store in new and unused condition, adhering to their Returns Policy.

Important points regarding the return process are as follows:

  1. Return Condition: The goods must be returned in new and unused condition, as originally received. It is important to ensure that the goods are in the same condition as when they were sent out.
  2. Return Timeframe: The goods must be received by the store within 21 days of notifying them about the cancellation. During this time, customers are responsible for any loss or damage that may occur during the return shipping process.
  3. Refund Process: Once the store receives the goods in new and unused condition, they will initiate the refund process. The purchase price will be refunded to the customer.
  4. Return Condition Inspection: If the returned goods arrive in a condition that is less than what they were sent out in, the store reserves the right to return the goods to the customer, and no refund will be processed.

It is essential for customers to carefully review the store’s Returns Policy and follow the specified procedures to ensure a smooth and successful return and refund process. For more detailed information or specific inquiries, customers should consult the store’s terms and conditions or contact the store directly.


According to the store’s return policy, the following guidelines should be followed for returning goods:

  1. Use Returns Form: Customers need to use the store’s provided returns form to initiate the return process. This form helps the store acknowledge that the goods are being sent back.
  2. Return for Testing: If the goods are being returned for testing, the customer is responsible for covering the return shipping expenses.
  3. Refund of Postage Fees: The store will only refund postage fees if the order arrives damaged or becomes faulty within the first 4 weeks of purchase. Proof of posting is important, and customers should ensure the goods are well-packed and obtain proof of posting as the goods remain their responsibility until received by the store.
  4. Refund of Postage Costs for Replacement: If goods are being returned within 7 days of purchase under the Replacement Policy, the store can refund postage costs. However, the customer needs to agree on a delivery service with the store in advance, and only standard or tracked shipping fees will be refunded. The store cannot refund the cost of any special delivery service.
  5. Non-Refundable Postage: Postage costs for goods returned for any other reason than those mentioned above are non-refundable. The store reserves the right to deduct the original postage cost from any applicable refund.
  6. Mistaken Purchases: If a customer has made a mistake in their purchase, they need to return the goods to the store. The customer is responsible for the return shipping costs in such cases.

It is important for customers to carefully follow the store’s return procedures and terms and conditions. For further details or specific inquiries, customers should refer to the store’s website or contact the store directly.


If customers receive faulty goods, the following guidelines apply according to the store’s policy:

  1. Notification of Faulty Goods: Customers must notify the store within 7 working days if they receive faulty goods. This notification should be made as soon as possible.
  2. Replacement Parts: If possible, the store will dispatch replacement parts for the faulty goods.
  3. Return of Goods: If replacement parts are not possible, the store may request customers to return the faulty goods in accordance with their Returns Policy. The specific return procedures and conditions should be followed.
  4. Verification of Damage: Once the store receives the returned goods, they will verify the damage. If the damage is confirmed, the store will supply the required replacements.
  5. Return Postage Costs: If the goods returned to the store are found to be in good working order, the store is not able to refund the return postage costs. Additionally, the store reserves the right to deduct their original postage cost from any applicable refund.
  6. Consequential Loss or Damage: The store cannot take responsibility for any consequential loss or damage that arises directly or indirectly from the goods supplied.

Customers should carefully review and adhere to the store’s Returns Policy and procedures for returning faulty goods. For further clarification or specific inquiries, customers should consult the store’s terms and conditions or contact the store directly.

Manufacturer’s Guarantees

The store works in collaboration with manufacturers to ensure that their guarantees are honored, and they make their best efforts to resolve issues within the warranty period. The following guidelines apply to refunds and replacements:

  1. Postage Costs under Manufacturer’s Guarantee: Postage costs can only be refunded if the goods are returned to the store within 7 days of the original purchase, as per the manufacturer’s guarantee.
  2. Refund of Postage Costs for Faulty Goods: The store will refund postage costs for guarantee/warranty returns only if the product becomes faulty within the first 4 weeks of receipt.
  3. Replacements with Manufacturer Authorization: Replacements, whether parts or goods, can only be offered when authorized by the manufacturer. Customers should contact the store for further guidance in such cases.
  4. Prior Approval for Returns: Goods should not be returned to the store without prior approval. Customers need to contact the store and obtain approval before returning any items.
  5. Replacement of Glass or Ceramic Items: Glass or ceramic items can only be replaced if the store is notified within 48 hours of receiving the delivery.
  6. Replacement of Glass Bulbs/Tubes: Glass bulbs or tubes can only be replaced if they become faulty within 14 days.

Customers should note and adhere to these guidelines to ensure a smooth and efficient resolution of any issues with their purchased items. For specific inquiries or further information, customers are advised to refer to the store’s terms and conditions or contact the store directly.


According to the store’s policy, customers have the following responsibilities regarding breakages:

  1. Checking Goods on Arrival: It is the customer’s responsibility to thoroughly check the goods upon arrival for any damage. This should be done before signing for the parcel. If the parcel appears damaged, it is advised not to sign for it.
  2. Reporting Breakages: Any breakages or damages must be reported to the store within 48 hours of receiving the goods. It is important to promptly notify the store to initiate the resolution process.

By carefully inspecting the goods upon arrival and reporting any breakages within the specified timeframe, customers can ensure that appropriate actions are taken to address the issue. For specific instructions on reporting breakages or further information, customers should refer to the store’s terms and conditions or contact the store directly.