i dont. it is a 55g tank, so it is 48 inches long and 12.6 inches wide. it is partioned into the sections- 1st section is 13 inches was going to be where the skimmer went, also the where the overflows are piped to. second area is 22 inches, was supposed to be for the refugium. and the 3rd area is 13 inches for the the heaters and return pumps. i am contemplating not even doing a refugium now and using that middle area for a larger skimmer.