I'm looking for a replacement for the ehiem classic 600. I have two on a 120 gallon tank and neither have great flow but one is a lot worse. I've cleaned it a couple of times and taken apart the propeller and everything seems fine but the flow sucks and I'm tired of wasting time with it. I would prefer a filter that is not much larger (physically) because the space behind the tank is very limited. Also because I am in a condo with wooden floors it is imperative that the filter does not leak. Are there specific recommendations ?
