I have actually never used Cyclops before, first time, but it does stink ( more than most thawed fish foods). I have used a few other frozen foods in the past, with so-so luck. I really don't put my faith in these frozen foods. They always seem to produce alot of waste in the tank to me. The CUC sure like them all, but not really the fish. I know some people swear by them. Maybe i just have not found the right ones.