Hi there, Just replaced the old filter with an Eheim 2215 canister filter. My question essentially is about where should I put the output hose in relation to it being above the water line / at the water line / or below it. If I put it above, it breaks the surface of the water and introduces a lot of oxygen bubbles. Putting it at, or below the water line makes it a lot quieter, and gently pushes the water around the tank. I'm happy with either method - but was curious as to how people normally set theirs up. I've only gotten back into fish keeping after about a 10+ year hiatus, and all the technology etc has changed... for the better. Any relevant info is appreciated! quick edit: Does it matter the length of the perforated tube - the one that came with the eheim is about a foot long - can I, or should I get something longer? Does it even matter. Sorry for the inane questions.