ditto... This sounds really odd. Swapping hoses wont do you any good in this situation somethings screwyJgray152;3116410; said:The cover can only go on one way. Sounds like you are running them together? Keep them separate. IF you take the cover of the canister off, the plastic tube that is standing straight up from the bottom of the canister at the pump is the OUTPUT.
The only way your Fx5 could pump backwards is if the impeller spun backwards and I don't think that is possible..
I wish I could take a look at it. I broke down and opened one of my FX5's earlier today and checked out the DVD it came with cool filter! Tempting to throw it on one of my tanks but they are more than maxed out and stable 
, i never took any tubes out just had the lid on the wrong way lol i noticed it was wrong when i looked at the fluval fx5 sign on the top, it was facing the other way to the 1 that is working properly, they are now both running perfectly