Damselfish

These require larger tanks (75+ gallons) and assertive tank mates that can hold their own.

( Chrysiptera cyanea ): Stunningly bright blue, but males are notoriously feisty and fiercely defend established territories. damselfish

( Dascyllus species): Hardy and active, but known to dominate rock formations aggressively as they mature. The "Avoid" List (Highly Aggressive) These require larger tanks (75+ gallons) and assertive