my blue tang had the ich first, the man at the fish store told me it is common for these fish to get it. now my damselfish has died and the blue tang looks like it doesnt have much time left, it can barely swim. my clownfish seems to be fine (but does have ich) but im thinking he is next. all my corals are perfectly fine. i have been treating the ich with "ich attack" a coral safe medicine. is there anything else i can do? do i have to start over?