Yes, I do feed them daily. I also aerated all summer, running only at night. The only issue that I've had was back in May when I first started up my aeration system. Even though I started very slow, I still had a pretty good fish kill (approx 50) consisting only of large bluegill. Is it possible some could still be feeling the effects of that? I'm really puzzled because other than that one incident in May, the pond has looked great.