Species description

Care, breeding and tankmates

Fish profile

Temperament

Territorial

The Tank goby is an aggressive, territorial bottom-dweller that will fiercely defend its chosen space from any intruders. While they may ignore fish swimming high above them, they will attack any fish that enters their bottom territory. They are fascinating, bold fish with a lot of personality for a dedicated predator tank.

Diet

Carnivore

In the wild, they are voracious carnivores feeding on small fish, crustaceans, and aquatic insects. In captivity, they eagerly accept meaty foods such as earthworms, chunks of fish, shrimp, and large frozen foods like bloodworms. They rarely accept dry foods and require a protein-rich diet to thrive.

Sex ratio

Solitary

Males generally grow slightly larger and have broader heads compared to females. They are highly territorial toward conspecifics, and males will often fight vigorously if kept together. It is strongly recommended to keep them singly unless breeding is attempted in a very large aquarium.

Feeding frequency

Twice daily

Adult Glossogobius giuris should be fed a substantial meal every other day. Overfeeding is a common issue that can lead to health problems and water fouling. Ensure that all offered food is consumed within a few minutes to prevent it from rotting in the substrate.

Bioload

The Tank goby is a robust, predatory fish that produces a substantial bioload, especially as an adult. Their carnivorous diet leads to significant waste production. Adequate biological and mechanical filtration, coupled with regular gravel vacuuming and water changes, are necessary to prevent water parameter degradation.

Flow

Moderate

They are highly adaptable and are found in various habitats from clear, fast-flowing streams to stagnant ponds. In the aquarium, a moderate water flow is generally preferred to maintain high oxygenation and sweep away detritus. Providing both areas of flow and calmer resting zones is ideal.

Jump risk

No

Reproduction

Oviparous

Breeding the Tank goby in a home aquarium has rarely been achieved. They are cave spawners where the female attaches eggs to the roof of a cave, and the male rigorously guards them. The resulting fry require microscopic live foods and are difficult to rear in standard freshwater setups.

Compatibility & tankmates

With caution

They are highly predatory and highly territorial, capable of swallowing surprisingly large fish. They should only be kept with fast-moving, robust fish that inhabit the middle and upper levels, and are clearly too large to be eaten. Keeping them with bottom-dwellers is not recommended due to severe territorial aggression.

Tank level

Bottom

As a true goby, they are strictly benthic, spending nearly all their time resting on or hovering just above the substrate. They require a soft, sandy bottom to prevent damage to their delicate bellies. They will claim a specific cave or hiding spot as their territory.