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Green Chromis

By The Aquarium Calculators Editorial Team ·

Chromis viridis

Complete Green Chromis care guide covering omnivore diet requirements, peaceful temperament, minimum 30 Gallons tank setup, and compatible saltwater tankmates. Difficulty: Easy.

Green Chromis

Quick Answer

Green Chromis (Chromis viridis) is a schooling damselfish commonly found in large aggregations above branching corals in the wild. It requires a minimum 30 Gallons aquarium with a pH of 8.1 - 8.4 and temperature range of 24-26°C. This omnivore occupies the middle zone and makes an excellent addition to community setups.

Intro

Green Chromis (Chromis viridis) is a schooling damselfish commonly found in large aggregations above branching corals in the wild. It is peaceful for a damsel.

Setup

A 30-gallon or larger reef tank with open swimming space and live rock for hiding. Moderate water flow.

Feeding

Omnivorous; eats marine flakes, pellets, frozen mysis, brine shrimp, and algae-based foods.

Compatibility

Peaceful for a damsel. Keep in schools of 5+. Good with clownfish, gobies, blennies, and other peaceful community fish. May become territorial as they mature.

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Tank Position
Middle
Water Temp
24-26°C
Adult Size
See profile
Water pH
8.1 - 8.4

Species Characteristics

Adult Size
Lifespan
Growth Rate
moderate
Tank Compatibility
Community compatible
Indoor Aquarium
Yes

Water Parameters

Water Temperature
Humidity
Water pH

Tank Lighting

Tank Lighting
Standard lighting
Light Hours
N/A
Intensity
moderate

Feeding & Diet

Diet Type
Diet: Omnivore
Feeding Schedule
N/A
Live Food Options
N/A

Continue Learning

Recommended Tools

Fish Compatibility Calculator fish compatibility

Health & Disease

Ich (White Spot Disease) common disease • all fish

Related Guides

Understanding pH in Aquariums water parameters • ph

Similar Species

Banggai Cardinalfish Care Guide: Tank Size & Diet semanticSimilarity Blue Green Chromis Care Guide: Reef Tank & Diet semanticSimilarity Coral Banded Shrimp Care Guide: Water Params & Breeding semanticSimilarity

Frequently Asked Questions

How many Green Chromis should be kept together?
Maintain a minimum school of 6 to 8 individuals in a marine tank of at least 40 gallons (150 liters) with a footprint of 30x18 inches (75x45 cm). Green chromis (Chromis viridis) are shoaling fish; groups under 6 develop a strict pecking order where dominant fish pick off weaker individuals over time. A school of 10+ reduces attrition but natural hierarchy still occurs. Provide open swimming areas with live rock structures as refuges. In tanks under 30 gallons, keep a single specimen. Avoid mixing with other damselfish species.
What are the precise marine water parameters for Green Chromis?
Target pH 8.1 - 8.4, specific gravity 1.023 - 1.025 (35-35.5 ppt), General Hardness 7 - 12 dGH, Carbonate Hardness 8 - 12 dKH, Total Dissolved Solids 32,000 - 35,000 ppm, Electrical Conductivity 45,000 - 55,000 μS/cm, and temperature 72°F - 78°F (22°C - 26°C). Maintain ammonia and nitrite at 0 ppm, nitrates below 10 ppm with weekly 20% water changes. Use a protein skimmer and live rock (1 lb/gallon). Stable salinity is critical; fluctuations >0.002 cause stress. Provide moderate water flow (10x turnover).
What is the nutritional and medication protocol for Green Chromis?
They are planktivores requiring 50% protein, 15% fat, 35% marine algae. Feed small portions multiple times daily (3-4 times) with vitamin-enriched brine shrimp, mysis shrimp, copepods, and high-quality marine flakes. Offer frozen cyclops and finely chopped krill. Medication alert: Tolerate copper (0.15 mg/L Cupramine) but sensitive to hyposalinity below 1.017. Use praziquantel for flukes. Quarantine with chloroquine phosphate (10 mg/L) for 14 days. Avoid formalin. Susceptible to uronema marinum; treat with metronidazole.
How to breed Green Chromis in captivity?
Condition a school of 6-8 in a 60+ gallon reef tank with live foods for 4 weeks. They are paternal mouthbrooders; the male clears a nest site on live rock. Spawning at dawn; female lays 50-200 adhesive eggs; male fertilizes and broods in mouth. Incubation lasts 12-14 days at 75°F (24°C); male stops eating. Releases fully formed fry (0.2 inches/5 mm) that accept baby brine shrimp and rotifers immediately. Remove male after release. Raise fry in a separate 20-gallon tank with gentle flow and feed 4 times daily.

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