A guy I met at the local F/S has been doing reef & Fish Only tanks for yrs.I told him that I was fixing to set up my 125 gallon reef tank soon.He told me he has been using sch 40 PVC and heating it and bending it and placing it in his tanks for swim throughs.He said he paints then black and places them at various levels in his live rock.I had heard of people doing something similar in fresh water but never in saltwater.He says as far as configurations you just use ur imagination.Anyone ever hear of someone else doing this?