I have a 30 gallon tank (tall, not wide) that currently is running a Penguin 200 bio wheel filter. I find the filter is pretty good, but loud. I constantly have the waterfall effect coming from the tank- even when the tank is filled right up to the spout of the filter- which if I kept it at this level, I would have to top up the tank every day. The tank water level seems to drop fairly quickly with this filter increasing the waterfall noise.
Does anyone have any suggesstion in how to either decrease the noise or in a quieter filter?