I just got a AC70 Yesterday and it is loud. It is making a buzzing noise. I have a AC110 in the tank right next to it and the AC110 is slilent. What could be causing the buzzing noise???
I have an ac70 on one of my tanks and i can barely hear it running. Sounds like you might have a problem with the impeller maybe? either way they have a lifetime warranty so either take it back or call the company.