Yeah I get Aquamax for $28 a bag with two feeders and it still gets expensive. But im seeing some amazing results from the Aquamax. Heck game fish chow is $22 a bag so whats 6 more bucks when you get that much better of a feed. Your pond must be fairly new for you to be feeding 400. I feed 500 and 600. I haven't tried the 400 yet but I can bet the pellets are tiny.