Diamond Watchman Goby care

Valenciennea puellaris · Saltwater · Intermediate level care

A peaceful goby that sifts sand for food.

Smallest tank55 gallons

Adult size6 inches

Temperature75 to 80°F

pH8.1 to 8.4

GroupFine on its own

TemperamentPeaceful

SwimsBottom of the tank

Lives3 to 5 years

Watch for: It needs a deep sand bed with pods and a well fed tank, and can jump from open tanks.

Feeding

Twice a day. A small pinch they finish in about 2 minutes. Frozen mysis, brine shrimp, small marine pellets.

Jumps. Keep a tight lid on the tank.

Fish that pass every check with Diamond Watchman Goby in a 110 gallon tank: same water, overlapping temperature, nobody gets eaten and no bullies.

Maroon Clownfish: Maroon Clownfish is aggressive and will bully peaceful Diamond Watchman Goby.
Blue Devil Damselfish: Blue Devil Damselfish is aggressive and will bully peaceful Diamond Watchman Goby.
Domino Damselfish: Domino Damselfish is aggressive and will bully peaceful Diamond Watchman Goby.
Orchid Dottyback: Orchid Dottyback is aggressive and will bully peaceful Diamond Watchman Goby.

What size tank does a Diamond Watchman Goby need?

At least 55 gallons. Adults grow to about 6 inches, so plan for the adult size, not the size at the store.

What temperature does a Diamond Watchman Goby like?

75 to 80 degrees Fahrenheit, with a pH of about 8.1 to 8.4. A steady temperature matters more than hitting one exact number.

How many Diamond Watchman Goby should I keep together?

One is fine. If you keep more, keep one male, since males fight each other.

What do Diamond Watchman Goby eat?

Frozen mysis, brine shrimp, small marine pellets. Feed twice a day: a small pinch they finish in about 2 minutes.

Checked against these sources on 2026-11-10. When sources disagree we use the safer number.