Quote Originally Posted by ugotd8 View Post
Yes, I too think it may be the res. I was running it at about 60% (3000RPM) and even when I had it lower I could hear the electronic whine of the pump. It was driving me mad!

I'm thinking an MCP655 at level 2 placed on foam down at the bottom in the HD cage with a res top may be the solution.
I'd try the cheaper option of a different res and top before purchasing a new pump.