I was given a FX2 and a fluval 406 canister filter by a neighbor who decided to switch to reptiles. FX2 easy to use and set up only issue I had was not turning the valves on. But this fluval 406 is hell I tell you. Ever since I cleaned it out I got a bad leak. Yes I used fluval silicone grease for the O ring and it still leaks. I have a new ring coming in the mail today so hopefully that helps. Any tips/tricks or should I just save up for an fx4.?