Since joining the forum, I am considering converting to a DSB. Currently I have +/-100kgs broken lr in the sump, in the middle 3 sections, sump is 1220x450x450. 1st section is a 15% bio balls, basically on the surface, sections 2,3,4 are live rock, section 5 holds the return pump and my skimmer (unfortunatly it cannot fit anywhere else, as I had bought it prior to fitting the tank onto the stand, and is unfortunatly stuck in there now, I will get an external skimmer later). I am thinking of braking the rock as small as possible, about 20mm to 50mm piecies, placing it in the 1st and second compartment, and then 3 and 4 DSB with live beach sand as well as cupfuls from here and there. Will start slowly at first moving bit by bit, but otherwise you agree?