I have a 55g tank with a couple of feather dusters, 2 peppermint shrimp, a few snails and a pink tipped annenome. i have hat a percula clown for under a week, and he is already showing signs of ick. the tips of his fins are rotting it seems and he has three or four white spots. i have a tank that i can use for QT but he is the only fish i have. any suggestions on treatments?