The aggression shown by Damselfish is to protect their territory. ... If you ask aquarium hobbyists about Damselfish, some may say they are super aggressive, will target their tank mates, batter them to death, and that they will even try to take a chunk out of your hand if they get the chance.

What is the most aggressive damselfish?

Two, Three, and Four-Stripe Damselfish

Hardy and easy to find in stores, many unsuspecting aquarists buy one or a group, not realizing that all Dascyllus are some of the most aggressive types of Damselfish.

Are damsel fish jumpers?

Damsels aren't "jumpers" the way, for instance, wrasses tend to be - but the only fish I know of that _can't_ jump are seahorses.