My Jewel Damsel hovered over the rocks like a hummingbird over a selection of particularly tasty flowers. At first, it was rather timid, but once it adapted to the tank, it tried to claim the whole thing. It is, in my experience, a very territorial fish. Even though mine never grew to more than 3 inches, I would not recommend this fish for aquariums less than 50 gallons. It is very quick and can harass all inhabitants if the tank is small.