Other peaceful fish (unless it's a tomato or maroon clown). Very large coral specimens that won't be disturbed if the clowns pick them as a surrogate host. Do not use tube anemones or elephant ear corals as both will eat clownfish and most other fish (even tangs!).
try ghost shrimp, and if you have a tight fitting lid try crickets (give them something to sit on above water). Buy a floating aquatic worm holder and fill it with black worms. Also try live brine shrimp.
