This has started over the last week and the fish are losing their appetite. mostly on my purple, chevron and sailfin tang (and symptoms on some other fish) I'm afraid they don't have much time left if it continues. Is it brook or ich. I thought it was ich and started treating with a mix metroplex, focus, reef plus vitamins and garlic as recommended by a few people. I don't have a hospital/ qt tank.. Any opinions, suggestions or ideas. Please help