Im thinking about loosing my 4 koralia 4s and going with 2 vortechs. My biggest progblem is that my tank is in wall and I only have 2" of clearnace on each side of the tank. One side is a closet with just 1 peice of sheet rock dividing it so that side is no biggy, the other side is an actual wall but I could cut a whole in it than remove the insulation but having the motor buried in the wall doesnt sit too good with me. So I have seen some people talk about running them on the back wall, anyone do this before and give me some advice?