AquaPro and throw a handful in every now and then. It'll be interesting to see what the fish do this year. I'm going to start a fish chart (size/weight), and switch the food from generic floating fish food ( the 1/8" pellets and the 1/4" floating catfish food)from Tractor Supply to Aquamax 500 or 600 depending on what gets eaten the most. I'll get a bag of each and see what size they perfer.