be careful on the beef heart..there diet is 97 percent fish and fish parts. i do give mine beef heart every few days as a treat but most people on here will say that its not good. sticking to fish is the way to go. the thing with feeders like everyone says is they could have parasites...i found out the hard way...although i didnt lose a fish they did get a parasite which they no longer have...but thats from feeders.