You'll want to feed it smaller meals more frequently. I avoid "fish food" and feed all of my bubble tips finely chopped pieces of squid, clam, shrimp, scallop, tuna, and whatever other seafood I can find at the grocery store. Chop up a pretty even portion of all the pieces and then freeze it in baggies 3/8" thick. Just break off a piece whenever you want to feed them.