Hello, I am new here, so please forgive me if I don't post this correctly. Anyway, this is the 2nd time I've tried adding a yellow tang to my tank. Both times, the tang lived fine for about 1 month - eating well, being accepted by the other fish, etc. Then all of a sudden, it stops eating, and dies in about 3-4 days. It still looks fine, but won't eat. I put green flakes in, as well as frozen mixes for saltwater fish. This second tang is in the not eating stage and I expect it will die within a day or two. Any suggestions?