In the summer he grows fast becasue I am able to catch and feed him live silversides all the time. Sometimes when my dad goes fishing he'll also cut up and freeze some of the fish he catches for me, bluefish, stripped bass, flounder, skates...
During the fall/winter/spring I cut up and feed him either frozen mackerel that I buy whole at some health store, frozen squid, or raw shrimp. This year I am thinking about just buying fish from the fish market and using that. Expensive, but its alot easier than working around the bones from a mackerel, and the squid always stinks up my hands for the rest of the day...The Sea Robin is also accepting chopped up frozen fish, so thats good.