I've never used Rod's but other people seem to swear by it. I buy seafood (clam, shrimp, crab, scallop, squid, etc) from the grocery store. Chop it up real fine (think 1/2 - 1/4 the size of a pencil eraser). Mix everything up and freeze it in plastic zip top bags. Only put enough in the bags so when they lay flat they are 1/4" thick. When you want to feed, just break off a chunk and thaw it in tank water. Feed your fish (and corals) with a turkey baster.