redtail catfish

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...

I remember when I bought the Redtail Catfish roughly more than a year ago, it was 3 inch long. It just cost me $3. That time I just a newbie in this hobby. I have join the Fishforum at the same time & learn how to keep my tank in good condition especially tank cycling. Actually Redtail catfish...