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.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard wild-type form. Males typically have longer, more pointed fins and a lighter grey body compared to the yellowish, smaller-finned females. Best kept singly or in a mated pair; groups require large tanks to prevent territorial fighting.
Differs in 1 trait from base species
Knight Goby Care Summary
The Knight Goby, scientifically known as Stigmatogobius sadanundio, belongs to the Gobies & Gudgeons family group. Adults reach a maximum size of approximately 9 cm and have a fusiform body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a medium level of biological waste.
To thrive, the Knight Goby requires a brackish tolerant aquarium with a minimum volume of 75 litres and a tank length of at least 60 cm. Water temperature should be maintained between 20°C and 28°C, with a pH range of 7–8.5 and a general hardness of 10–30 dGH. A moderate water flow is preferred. To replicate their natural habitat, the tank should include sand (sifters), shells (breeding/hiding), and driftwood (digestion/hiding).
Knight Goby can be kept singly or in a group, making them flexible additions to most setups. Keepers should be aware that this species may nip the fins of slow-moving or long-finned tankmates, is not safe with ornamental shrimp, can be aggressive toward its own kind, and will defend a territory within the tank. The Knight Goby is typically available in one standard form.
Similar Species
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.
Neon Blue Goby
Stiphodon atropurpureus
A stunning, specialized freshwater goby native to fast-flowing hill streams in Asia. Males display brilliant neon blue metallic coloration, while females are striped. They are specialized biofilm grazers ('Aufwuchs' eaters) and require mature tanks with established algae/biofilm stones. They are obligate stream dwellers requiring high oxygen and strong flow.
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).
Empire Gudgeon
Hypseleotris compressa
A remarkably adaptable and beautifully colored sleeper goby (not a true goby) native to Australia and New Guinea. They inhabit both pure freshwater streams and brackish estuaries. While generally peaceful and excellent community fish, they are micropredators that will happily consume dwarf shrimp and very small fry.
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.
Green Spotted Puffer (Brackish)
Dichotomyctere nigroviridis
The Green Spotted Puffer is a highly intelligent but notoriously aggressive fish. While frequently (and incorrectly) sold as a freshwater species, they strictly require brackish water that increases in salinity as they mature, eventually needing high-brackish or full marine conditions as adults. They have beak-like teeth that grow continuously and must be worn down by a diet of hard-shelled foods. Best kept entirely alone.