Thanks. I am still trying to understand the negative parts of sand "collecting detritus", I guess what are they worried about? I run a semi-triton system (no filter socks in sump) on my tank, and I do not have out of control NO3 and PO4, and I feed frozen and pellets 2-4 times a day. My PO4 is a bit high at .1ppm, but nothing crazy. Corals are happy, not as happy as yours . And I can't grow my chaeto either, not sure why when NO3 is at 2ppm. Great looking tank!