CheckMyFishTank

Green Chromis care

Chromis viridis · Saltwater · Beginner level care

Green Chromis, painted illustration

A peaceful, shimmering green schooling fish that does best in a group.

Smallest tank55 gallons
Adult size3 inches
Temperature76 to 80°F
pH8.1 to 8.4
GroupA group of 5 or more
TemperamentPeaceful
SwimsMiddle of the tank
Lives5 to 8 years
Watch for: They are shy singly and stress in small tanks, so keep a group in a 55 gallon or larger.

Feeding

Twice a day. A small pinch they finish in about 2 minutes. Marine pellets, flakes, frozen mysis.

Good tank mates

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

Banggai CardinalfishBicolor BlennyNeon GobyOcellaris ClownfishPajama CardinalfishPercula ClownfishRoyal GrammaSix Line WrasseSkunk ClownfishYellow Watchman Goby

Do not mix with

  • Maroon Clownfish: Maroon Clownfish is aggressive and will bully peaceful Green Chromis.
  • Blue Devil Damselfish: Blue Devil Damselfish is aggressive and will bully peaceful Green Chromis.
  • Domino Damselfish: Domino Damselfish is aggressive and will bully peaceful Green Chromis.
  • Orchid Dottyback: Orchid Dottyback is aggressive and will bully peaceful Green Chromis.

Questions

What size tank does a Green Chromis need?

At least 55 gallons for a group of 5. Adults grow to about 3 inches, so plan for the adult size, not the size at the store.

What temperature does a Green Chromis like?

76 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 Green Chromis should I keep together?

Keep 5 or more. They feel safe in a group and show better color and behavior.

What do Green Chromis eat?

Marine pellets, flakes, frozen mysis. Feed twice a day: a small pinch they finish in about 2 minutes.

Sources

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