"My fish just LOVE these pellets, whether the S size or the Micro pellets. They will snub their fins at flake food if they think they will get the Marine S or Marine Micrlopellets. All the fish in the tanks love this stuff: Beta, Platty, Fat belly Molly, Rainbow Shark, Redtail Shart, varieties of catfish, Black Mollys, danios,....well you get the picture. The frogs will dig pellets out of the rock on the bottom of the tank. No waste, it all gets eaten and my fish are HUGE. I had 7 tanks and have cut down to 4 large tanks. I've tried all kinds of food--I know what I am talking about."