My threadfin is a pig, and he greedily eats brine shrimp, Formula 2 flake, my formula Angel food with sponge and any other dry food that I add.
He is also one of the first fish on the scene whenever I add a raw clam to the tank. I would try feeding yours some clam or muscle to get thing going ....do you have other fish, and if so are they eating normally? Is the threadfin being bullied during feeding time?
