Marine Fish Compatibility Chart: Safe Tankmate Guide

Marine fish compatibility management is even more critical than with freshwater tropical fish. Many species have strong territorial instincts or high aggression toward same-species or closely related fish, making research beforehand essential.

Basic Principles for Successful Community Tanks

• Provide adequate tank size: Small tanks intensify territorial disputes
• Use live rock to divide space: Breaking sight lines reduces territorial behavior
• Introduce fish simultaneously: Adding all fish before established territories form helps them adjust
• Mind size differences: Larger fish may eat smaller tankmates

Compatibility Guide by Family

Damselfish - Aggression varies greatly by species - Blue-Green Chromis: Peaceful and can be schooled. Compatible with nearly all fish - Blue Devil and Yellowtail Damsel: Strong territorial instinct, aggressive toward same and other species - Three-Stripe Damsel: Aggressive toward other fish. Community keeping only in large tanks

Angelfish (Pomacanthidae) - Large angels have very strong territorial instincts - Same-species/same-genus community keeping is generally not recommended (especially males) - Small angels (Coral Beauty, etc.) are relatively peaceful but individual variation exists - Different species can sometimes be kept together in large tanks (90cm+)

Tangs (Surgeonfish) - Keeping multiple of the same species is almost always not recommended (territorial fighting) - Even different species of similar appearance may fight - Generally compatible with other fish families

Gobies - Most gobies are peaceful and easy to keep in community settings - Males of the same species may show territorial behavior - Sand-burrowing species require appropriate substrate

Wrasses - Most are peaceful, but larger species may eat small fish - Require sand substrate as they burrow at night

Incompatible Combinations

| Combination | Reason | |-------------|--------| | Same-species angel males | Territorial fighting can be fatal | | Large groupers + small fish | Will eat anything that fits in their mouth | | Lionfish + small fish | Predation risk | | Multiple same-species tangs | Intense aggression toward conspecifics | | Scorpionfish + shrimp | Will eat shrimp |

Tank Size Guidelines

• Small fish community: 60cm or larger
• Including medium angels/tangs: 90cm or larger
• Including large fish: 120cm or larger

Find Marine Fish on Bri-Choku

On Bri-Choku, you can purchase marine fish directly from specialist breeders. Getting expert advice on compatibility questions and species selection for your tank size is one of the biggest advantages of buying through Bri-Choku.