I am finally going to drill my 2x4x1 60G frag tank. I have been working on the sump and other preparations. (Moved the water tanks today). I need to make a decision on which overflow system to used. The basic choices are: Back mount 700GPH (single) Glass-Holes overflow 1500GPH (dual) Glass-Holes overflow (twice the fun for reliability) OceanLife Overflow 2.2 (I haven't found a US vendor yet) XAQUA X-INOUT (I haven't found a US vendor yet) Something else? Standpipe (bottom drill) Maggie Muffler single 1 1/2" Maggie Muffle dual 1 or 1 1/4" (for reliability) something else? I am leaning toward backmount because I have found the standpipe in my current tank to be an obstacle to racks, etc. Two of them would be even worse. Suggestions, warnings, alternatives?