Originally Posted by CKY
I already have the blue damsel and the domino damsel. I find that the blue damsel is not aggressive at all and keeps to himself while the domino is the meaner one. Do you suggest I return the domino?
If you have a blue devil damsel which is probably what you have since you call it a blue damsel, if you take the domino out which I would then the blue will become aggressive to anything else. The domino will always be the bully but if you take him out the blue will take over. Plus dominos can reach a length of six inches and they loose the white spots. Blue damsels can get to be about 4 inches and are almost as aggressive. Unless you are going with big fish that can hold their own (which in a 55 gallon you probably aren't) I would get rid of the damsels and get yourself some more peaceful colorful fish. Small reef safe wrasses are really nice fish for a tank that size. Dwarf angels, cardinalfish, chromis, small butterflyfish, plus more. Make sure you know the personality and eventual size of the fish you get.