I'm currently trying my hand at PVC plumbing, because I bought the Rainbow-Lifegard filtration system. A triple mech, 2 triple heaters, Sandbed, and external CO2 diffuser. This way I hope to reduce clutter in the tank to minnimum ?sp?. My only dilema is how to position the return tube to make sure of good circulation through the tank w/o too much surface agitation and keeping the piping from being visible as much as possible. My current plan is to run a tube along the bottom in back with holes drilled along the length of it pointing upwards. You guys will have to let me know what you think of that Idea.