I don't want to get in a tang fight here..so i will just tell you what mine likes to eat.
I give mine a strip of brown nori every other day. Get the dries, not the roasted. He loves the stuff and attacks it as soon as i put it in. I also give him shrimp, flake, brine, plankton, and algae pellets. He isn't too fussy and is growing like a weed. See if there are an asian grocery stores in your area. You can get a lifetime supply of the nori for about ten bucks.