I bought some of this at the fish store because they didn't have the brand I usually use. It is like blocks of rubber! Does anyone else use this food? My fish loved the other brand (Cichlid Delight, Emerald Entree, and Frozen bloodworms by San Francisco Bay). It was pretty messy and sent a cloud of particles through the water but they went crazy for it. They don't seem as keen on the Ad Konings. And anything that feels like a bicycle tire, doesn't seem like it would be good for their digestive system. I've seen the Ocean Nutrition flakes highly recommended though.