mine fish always did it and then the shrimp usually comes up to the other side of the bag.. well not ram so much as swim against it ha damsels are evil little fish though
Sheesh folks, not all damsels are evil, there are some FANTASTIC reef fish out there that happen to be damsels. It only takes a little bit of time to do some research BEFORE bringing home that potential-monster of a domino or jewel damsel.
I don't know how liveaquaria decided they get 3-4" but with the exception of the canary damsel, they max out at more like 2", they're just agressive enough to stick up to larger fish in the tank, they're colorful and almost bulletproof. And cheap!
I really like the canary damsel and the chromis, but the yellowtail damsel and the azures are one of the ones we usually talk about as mean. With the blue devil damsel being the worst of them all.