I like that set up.. especially with the pipes. Are the back ends higher up than the front. If not, I would be afraid that they would act as a trap for detritus and cause water probs. later. Not sure but it is something I have thought of in the past. I really like it though. Is that koralia a nano? Does it affect the returns? I thought about putting one there in mine, but I wasn't sure how it would affect the return flow.