I run a pond filter on my 6ft tank with the pump in tank and its a pain!! id go a fx5 or any other canister filter if i was to do it again, it dosnt have taps so makes a mess everytime i remove it,it weighs a lot as it holds about 20L, and reconnecting the hoses and getting them to seal is an art in itself. The steraliser works a treat tho i havnt had a sick or dead fish since i got it and that was about a year ago now (touch wood)