Ok i looked at spectrum this morning and i almost cried... i saw the same white/clear fuzzish stuff spread all over his body in clumps as if he rolled in feathers... this happened to midnight too the day or two before he died. I only had spectrum and midnight for like two weeks! Whatam i doing wrong? is it juts the petstore?

He is in a 2.5 gallon filtered and heated tank uncycled. I feed him hikari bio gold pellets 5 days a week fd bloodworms 1 day and fast him 1 day. The temp is currently 79 degrees fareighnheight. I have some melafix and the equiptment for salt baths and as for the melafix i dont know how much to add to my size tank. (Bottle doesnt say) And i'm not sure i should put it so PLEASE HELP SPECTRUM!