The Marble Goby (Soon Hock) is one of the largest freshwater gobies in the world. As a strictly carnivorous, nocturnal ambush predator, it is incredibly inactive during the day but will swallow any tankmate that fits into its massive mouth. Due to its enormous adult size, it is strictly a 'monster fish' and requires highly specialized care and heavy filtration.
Marble Goby At a Glance
Marble Goby Tank Requirements
Will Marble Goby fit in your tank?
Care guides tell you what Marble Goby needs, the next question is whether your tank can safely provide it. Test Marble Goby against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Marble Goby Water Parameters
Water care products
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Marble Goby Temperament & Compatibility
Marble Goby Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Adult / Standard
The fully grown adult requires a massive aquarium footprint. While they are highly inactive, their heavy, meat-based diet produces an extreme bioload requiring powerful filtration. They will consume any fish smaller than half their length.
Same care requirements as the base species
Also known as: Adult, Monster Fish
Juvenile (Grow-out)
Sold at smaller sizes in the trade. They grow rapidly when fed properly and will quickly outgrow standard aquariums. Even as juveniles, they are voracious predators of smaller tankmates.
Differs in 4 traits from base species
Also known as: Baby, Grow-out, Juvenile
Marble Goby Care Guide Summary
The Marble Goby, scientifically known as Oxyeleotris marmorata, belongs to the Gobies & Gudgeons family group. Adults reach a maximum size of approximately 60 cm and have a depressed body shape with a moderate growth rate. Classified as aggressive, this species primarily occupies the bottom zone of the aquarium and produces a extreme level of biological waste.
To thrive, the Marble Goby requires a brackish tolerant aquarium with a minimum volume of 600 litres and a tank length of at least 180 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 6.5–8 and a general hardness of 5–20 dGH. A low water flow is preferred.
Due to its specialist needs, the Marble Goby is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Adult / Standard and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Marble Goby Habitat Setup
When setting up an aquarium for the Marble Goby, a low water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour, smooth gravel or rounded substrate to protect their sensitive barbels, and driftwood, which can serve as both a hiding place and a dietary supplement.
Marble Goby Compatibility Notes
Classified as aggressive, the Marble Goby is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, ornamental shrimp are not safe companions, and territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Marble Goby Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Marble Goby.
Marble Goby Feeding & Diet Considerations
The Marble Goby is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided, will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups, and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition.
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Frequently Asked Questions About Marble Goby
How big does Marble Goby get?
Marble Goby (Oxyeleotris marmorata) typically reaches a maximum adult size of approximately 60 cm. They have a depressed body shape and a moderate growth rate.
What tank size does Marble Goby need?
A minimum aquarium volume of 600 litres and a tank length of at least 180 cm are recommended for Marble Goby. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Marble Goby need?
Marble Goby thrives in brackish tolerant conditions with a temperature range of 22–28°C, a pH between 6.5 and 8, and a general hardness of 5–20 dGH. A low water flow is preferred.
Is Marble Goby peaceful or aggressive?
Marble Goby is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Marble Goby live with others of its kind?
No. Only one Marble Goby should be kept per tank. Keeping multiples in the same aquarium typically results in aggression and stress.
Is Marble Goby safe with shrimp?
No. Marble Goby is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Marble Goby have any special tank requirements?
Yes. Marble Goby benefits from sand (sifters), driftwood (digestion/hiding), and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Plants That Suit Marble Goby
These plants pair well with Marble Goby based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Banana Plant
Nymphoides aquatica
Beckett's Water Trumpet
Cryptocoryne beckettii
Broad-leaved Crypt
Cryptocoryne pontederiifolia
Fish Similar to Marble Goby
Knight Goby
Stigmatogobius sadanundio
A distinct, high-bodied goby found in estuaries across South Asia. Unlike most bottom-dwelling gobies, the Knight Goby frequently hovers in the water column. While often sold as freshwater fish, they thrive best in slightly brackish water (SG 1.003-1.005) or very hard, alkaline freshwater. They are territorial and notorious fin-nippers, making them poor tankmates for Guppies or Bettas.
Indonesian Giant Snakehead
Channa micropeltes
One of the largest, most aggressive, and predatory freshwater fish in the world. The Giant Snakehead is an apex predator equipped with a labyrinth organ, allowing it to breathe atmospheric air. In captivity, they require massive, heavily secured indoor ponds or custom ultra-large aquariums. They possess crushing jaw strength and will consume or brutally attack almost any tank mate.
Peacock Gudgeon
Tateurndina ocellicauda
A stunning, peaceful freshwater sleeper goby from Papua New Guinea. Known for their vibrant blue, red, and yellow colors, they are excellent nano-tank inhabitants. They are not true gobies (they lack fused pelvic fins) and are exclusively freshwater. They prefer slow-moving water, dense vegetation, and small caves (like PVC pipes or smooth stones) for spawning.
Bumblebee Goby (Brackish)
Brachygobius xanthozonus
A miniature, bottom-dwelling goby famous for its striking black and yellow stripes. While they are often sold as freshwater fish and can survive in it temporarily, they are highly susceptible to fungal infections in fresh water and truly require a brackish setup (SG 1.002-1.005) to thrive long-term. They are notoriously picky eaters, often ignoring flakes in favor of live or frozen foods (like bloodworms or brine shrimp).
Violet Goby (Dragon Goby)
Gobioides broussonnetii
Often misunderstood due to its terrifying 'Dragon' appearance and sharp teeth, the Violet Goby is actually a gentle, nearly blind scavenger and filter feeder. It uses its teeth to scrape algae, not to bite fish. It requires brackish water to thrive long-term and fine sand to sift through for food. It is not a predator.
Largemouth Bass
Micropterus salmoides
An iconic North American game fish occasionally kept by 'monster fish' enthusiasts. They are highly intelligent, robust, and voracious apex predators with cavernous mouths capable of swallowing surprisingly large prey. Because of their massive adult size, rapid growth, and heavy bioload, they are strictly suited for massive custom aquariums or indoor/outdoor ponds.