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Blue Green Chromis

By The Aquarium Calculators Editorial Team ·

Chromis viridis

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

Blue Green Chromis

Quick Answer

Blue Green Chromis (Chromis viridis) is a small, schooling damselfish found in Indo-Pacific reefs. 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

Blue Green Chromis (Chromis viridis) is a small, schooling damselfish found in Indo-Pacific reefs. Their shimmering green-blue color is beautiful in groups.

Setup

A 30-gallon or larger reef tank with plenty of 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. Feed small amounts twice daily.

Compatibility

Peaceful but may pick on small shrimp. Keep in groups of 5+. Good community fish for reef tanks with clowns, gobies, wrasses.

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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 Coral Banded Shrimp Care Guide: Water Params & Breeding semanticSimilarity Firefish Goby Care Guide: Reef Tank & Diet semanticSimilarity

Frequently Asked Questions

How many Blue 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). Blue green chromis (Chromis viridis) establish a strict pecking order; groups under 6 lead to dominant fish slowly picking off weaker individuals over months. A school of 10+ reduces aggression but natural attrition 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 Blue 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. Use a protein skimmer and live rock (1 lb/gallon). Stable salinity is critical; fluctuations >0.002 cause stress. Provide strong water flow (10x turnover per hour). Add iodine (0.06 ppm) for health.
What is the nutritional and medication protocol for Blue 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 at 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, which causes gill damage. They are susceptible to uronema marinum; treat with metronidazole.
How to breed Blue Green Chromis in captivity?
Condition a school of 6-8 in a 60+ gallon (227 liter) reef tank with live foods for 4 weeks. They are paternal mouthbrooders; the male clears a nest site on live rock. Spawning occurs 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. He 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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