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.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Unsexed
Juveniles or unsexed individuals commonly sold in stores. They display a subtle, earthy, silvery-brown coloration before reaching sexual maturity.
Differs in 1 trait from base species
Also known as: Juvenile
Male
Mature males develop spectacular, vibrant red, orange, and black bands on their dorsal and anal fins, especially when displaying to females or rival males. Mildly territorial with other males.
Differs in 2 traits from base species
Also known as: Breeding Male, Show Male
Female
Slightly smaller than males and maintains a more cryptic, silvery-brown coloration year-round. Highly peaceful and can be kept in groups to diffuse male attention.
Differs in 2 traits from base species
Also known as: Female Gudgeon
Empire Gudgeon Care Summary
The Empire Gudgeon, scientifically known as Hypseleotris compressa, belongs to the Other family group. Adults reach a maximum size of approximately 12 cm and have a compressed body shape with a moderate growth rate. Classified as mostly peaceful, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a low level of biological waste.
To thrive, the Empire Gudgeon requires a brackish tolerant aquarium with a minimum volume of 110 litres and a tank length of at least 90 cm. Water temperature should be maintained between 20°C and 28°C, with a pH range of 6.5–8.5 and a general hardness of 5–20 dGH. A moderate water flow is preferred. To replicate their natural habitat, the tank should include plants - densely covered, driftwood (digestion/hiding), and sand (sifters).
Empire Gudgeon can be kept singly or in a group, making them flexible additions to most setups. Keepers should be aware that this species is not safe with ornamental shrimp and is a known jumper, so a tight-fitting lid is essential. This species is available in 3 varieties: Standard / Unsexed, Male, and Female. 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.
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.
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.
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.
Dwarf Gourami
Trichogaster lalius
A peaceful to semi-aggressive labyrinth fish native to South Asia. Famous for their brilliant metallic blue and red stripes. While generally suitable for community tanks, males are territorial toward each other and similar-looking fish. They are sensitive to water quality and prone to Iridovirus if stressed. Requires access to the surface to breathe.
Mbu Puffer
Tetraodon mbu
The largest freshwater pufferfish in the world, originating from the Congo River. Known for their 'puppy-like' intelligence and personality, they recognize owners and interact with them. However, they grow to massive sizes and possess a beak capable of crushing hard-shelled invertebrates. Unlike many puffers, they are true freshwater fish and do not need salt. They require massive filtration and a diet of hard foods (clams, snails) to keep their teeth trimmed.
Dwarf Pea Puffer
Carinotetraodon travancoricus
The Dwarf Pea Puffer is a tiny, fully freshwater pufferfish native to India. Despite their cute appearance, they are fierce micropredators and notorious fin-nippers. Modern husbandry standards strongly dictate they are highly social and must be kept in species-only shoals of 6 or more in heavily planted aquariums to disperse aggression and reduce stress. They require a steady diet of small snails and live/frozen foods.