I am looking a build a fish rack, because my store bought shelving rack just doesn't do what I want it to. I would greatly appreciate if those of you who do have racks, could post s or give me ideas for designing my tank rack. Id like to have 10 gallon tanks, 29 gallon tanks, and one 75 gallon (which I will need lots of support for!) Also, how large should I design the "gaps" in between each level for access to the tanks? Thanks in advance!