redtail

hey guys so I currently have a 14inch red tail catfish. Yesterday I fed him his usual amount of goldfish and soon after he became unusually lethargic. Much more than normal. And this morning I awoke to all the fish he had ate being dead across the tank most of them still whole and he is still...

Hello.  I have 4 African banned barbs, 4 zebra danios, a 3 inch redtail, 2 silver tipped tetras, and 1 dwarf pleco.  I have a 30 gallon tank that's in very good shape.    All fish are healthy.  I need advice though.  My tank, though active, visually looks a tad empty.  My question is, given the...