Longfin Black Ocellaris.

Genuinely peaceful and reef-safe. Occupies the mid-to-upper column near a burrow entrance and has no documented aggression toward clownfish. Territories do not overlap: Firefish defend a burrow hole; clownfish defend an anemone or host coral. No fin-nipping history. Only meaningful husbandry note is they are strong jumpers and require a tight-fitting lid — not a compatibility issue with the clownfish.

Well-documented clownfish companion across the hobby. Territorial behavior is tightly focused on a single rock crevice; clownfish territory centers on a host anemone or coral — the two zones do not compete. Gramma aggression (brief dashes, open-mouth displays) is directed at fish entering its specific cave, not at free-swimming neighbors. No fin-nipping toward other species reported. Widely listed as a primary clownfish tankmate recommendation.

Consistently rated one of the safest clownfish companions — slow-moving, docile, and fully reef-safe. Poses zero predation risk (similar size, 3 inches), no territorial overlap with clownfish, and no fin-nipping behavior. Multiple independent sources confirm successful mixed-reef cohabitation with clownfish.

The standout peaceful exception among damselfish. Multiple sources confirm they are compatible with clownfish and do not bother other community species. Explicitly listed as a safe longfin clownfish tankmate. Note: intra-group hierarchy can thin small groups over time (keep 6+ in 55+ gallons to distribute aggression within the school); this is a Chromis management concern, not a clownfish compatibility issue.

Peaceful, slow-swimming, and one of the most commonly recommended clownfish tankmates in reef systems. Intraspecific male-male aggression is the primary concern (keep singly, as a bonded pair, or in a simultaneously introduced group with ample hides) — the species shows no aggression toward clownfish. Reef-safe with no fin-nipping history.