I love my xp3 filters and they are a great bang for there buck. Well one of mine is flowing strong but about every 10 seconds the flow slows down dramaticly for like a second... Not a big deal but it is kind of anoying. The canister is right next to the aquarium on the same platform the aquarium sits on(a big like 10 ft thing across the room conected to the wall(There are 2x4s under it beacause a 75 gallon is on it)... it started doiong this after i rinsed the media out and took the filter apart(the turtle is very messy and the flow rate was like half and you would know why if you looked how discusting the inside of the canister was)... well I am guisuing not having the canister under the tank has to do with this. i have put cups of water in the thing you unscrew to add watwer to it on the intake... i have dobne that a few times beacause i think air is trappeds in the filter... If you think it is something difrent please mention it... Thanks