I got a 9.5in clown knife.The lfs said to feed it gold fish.What more can I feed it.The lfs had it for about a year and they fed it fish.

I had a 16" CK that was on feeders only before I got it. I starved him for a few days, threw some shrimp in, and he's taken whatever I offer ever since then. It shouldnt be too hard.
try beefheart, shrimp, krill, pellets, even fish fillet.
