ok my dad has got a marine tank and he added a flame angel last week and the was a potters angel alredy in there they had a little scrap just for the pecking order as the potters was bigger, now the flame has now got whotespot how and what is the best way of treating this? we do not have a QT and we have corals inside its a 50-55gallon tank with:3 cromis, 2 clowns, 1firefish,1 blennie,1potters angel and 1flame with about 8 snails,10 blue leg craps, 2 cleaner shrimp and a starfish . help please