I agree with the advice given, and won't repeat what's already been said. But, another thought: I'm not sure how long you've had the damsels or if you QTd them, but if they've got any parasites like ich that is in your tank now. Hopefully you've had them long enough for anything they could have to manifest itself. Just another reason to avoid cycling with fish. But you learn as you go, we all do. Good luck with your new tank!