Get an Eheim or a fluval. I have an Eheim 2215 on my 29 and it is DEAD silent even after a few years. I think the Eheim classic series are literally the most simple design. Water goes in the bottom, is sucked upward through the multiple filtration stages and is piped out the top back into the tank. Once you actually see it for yourself you'll realize how easy it simple it actually is.