Just thought I would share a quick note on the Fluval FX5. What was the phrase I was looking for? ......... oh yeah ......... "Holy Crap!". Granted I am not using it for fish. My unit is for an adult female Common Snapping Turtle in a 150 gallon trough. This thing craps like a dog and is a very messy eater. The unit is the size of a shop vac and looks alot like one as well. Aside from the turtle tearing up the output nozzle, it has been an amazing machine. It keeps the tank crystal clear for over a month. By far the best filter I have ever used. If it can handle adult turtles and gators up to 3', it can take care of fish with little effort.