I have an Aquaclear Powerhead 802 and one of my puffers keeps gettting suck on by it! Luckily no really damage has been done to the puffer but thats proabbly becasue I turned the powerhead off on time! So for the past few days may tank has been running without a powerhead (Could this by why I have a brown alge problem?I started another thread about that) I have decided to run a tube down to the bottom fo the tank( hopefully that will reduce the suction pull on the fish)but the problem is that I cant have it to close to the bottom cause its a sand substrate! Should I even have a powerhead at all if its not being used with an undergravel filter? What do i use in place of the powerhead if that is the case? Thanks!