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Marbled Sleeper Goby
Oxyeleotris marmorata
📍 Southeast Asia
The Marbled Sleeper Goby is a large, ambush predator native to Southeast Asia, prized by hobbyists for its striking marbled patterning and impressive size. It is a sedentary, bottom-dwelling fish that spends much of its time motionless, waiting for prey to pass by. Due to its predatory nature and potential to grow very large, it is best suited for experienced aquarists with spacious setups.
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Care Guide
Diet
The Marbled Sleeper Goby is a strict carnivore that thrives on live or frozen foods such as feeder fish, prawns, earthworms, and large bloodworms. Juveniles can be fed smaller live foods like guppies or ghost shrimp, while adults require larger prey items. Feed adults 2-3 times per week, as overfeeding can lead to obesity and water quality issues.
Behavior
This species is a classic ambush predator, spending most of its time resting motionless on the substrate or among decor, waiting for prey to come within striking distance. It is largely solitary and highly territorial toward conspecifics and similarly sized fish. Despite its sedentary appearance, it can strike with remarkable speed and will consume any tankmate small enough to fit in its mouth.
Breeding
Breeding in captivity is rarely achieved and considered very difficult. The species is reported to be a substrate spawner, with the male guarding the eggs until they hatch. Replicating the specific environmental triggers, such as seasonal water changes and appropriate space, makes successful captive breeding extremely challenging.
Tank Mates
Large enough to avoid predation but may compete for space; monitor closely
Similar size and habitat; both are predators so aggression is possible but cohabitation can work in very large tanks
Large enough to avoid being eaten; both occupy bottom zones so space is essential
Occupies upper water column, reducing direct competition; ensure fish are too large to be swallowed
Similar size range; both are aggressive predators and require a very large tank to coexist
Fast-moving and may outpace the goby, but smaller individuals risk predation; only large adults are suitable
Common Diseases
Ich (White Spot Disease)
Small white spots on body and fins, flashing against surfaces, lethargy
Raise temperature gradually to 30 C, treat with ich medication such as malachite green or copper-based treatments; ensure good water quality
Bacterial Infection (Columnaris/Fin Rot)
Frayed or rotting fins, white or gray patches on skin, ulcers
Improve water quality, perform frequent water changes, treat with broad-spectrum antibiotics such as kanamycin or nitrofurazone
Internal Parasites
Bloating, wasting despite eating, stringy white feces, lethargy
Treat with antiparasitic medications such as metronidazole or praziquantel added to food or water
Dropsy
Swollen abdomen, raised scales giving a pinecone appearance, lethargy
Isolate affected fish, treat with antibiotics such as kanamycin, improve water quality; prognosis is often poor once advanced
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Quick Facts
- diet
- Carnivore – live or frozen fish, shrimp, worms, and meaty foods
- lifespan
- 10-20 years
- max size
- 60 cm (24 in)
- tank size
- 200 gallons minimum
- temperament
- aggressive
Water it likes
- ph
- 6.5-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 5-15 dGH
- temperature
- 75–82°F (24–28°C)