What size tank does a Knight Goby need?

Knight Goby needs a minimum of 20 gallons, with 30 gallons recommended. They are bottom swimmers.

Is Knight Goby good for beginners?

Knight Goby is rated "intermediate" difficulty (2/5). Great for beginners.

What fish are compatible with Knight Goby?

Knight Goby is semi-aggressive. Compatible tank mates include other semi-aggressive fish with similar water parameters (pH 7-8.5, temp 72-82°F). Give adequate territory space.

Knight Goby

Stigmatogobius sadanundio

Family: Gobiidae • Origin: Various

Knight Goby (Stigmatogobius sadanundio) is a semi-aggressive other reaching 3.5 inches. Can be kept singly. Minimum tank: 20 gallons.

Min Tank

20 gal

Max Size

3.5"

Temperature

72-82°F

7-8.5

Lifespan

4 years

School Size

Solo OK

Swim Level

bottom

Hardness

5-15 dGH

semi-aggressiveintermediatecarnivore

Is Knight Goby Right for Your Tank?

Knight Goby is an excellent choice for beginners — rated "intermediate" difficulty (2/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. A 20-gallon tank minimum is standard — most community setups will accommodate them.

Knight Goby is semi-aggressive — they can live with others but may bully smaller or slower fish. Choose tank mates carefully. They are territorial — provide adequate hiding spots and maintain enough space to reduce aggression. Expected lifespan: 4 years with proper care.

Common Mistakes with Knight Goby

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Relying on a heater without a thermometer

Knight Goby needs 72–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 20 gallons

Many beginners underestimate tank size needs. Knight Goby requires at least 20 gallons — ideally 30. Cramped tanks lead to stunted growth, aggression, and poor water quality.

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Housing with peaceful nano fish

Knight Goby is semi-aggressive and territorial — small, peaceful species like neon tetras, endlers, or celestial pearl danios will be stressed, bullied, or eaten. Choose tank mates that can hold their own.