Ok in the next couple weeks I'm planning to build a rack to allow for expansion of my collection. I want the rack to be able to hold 3 sizes of tubs for hatchlings juvies and adults. I can't seem to find a brand of tub that offers three sizes with the same height. Assuming I'm not going to find them my thought was I would build each shelf tall enough to hold the tallest tub then I could just leave the lids on the other shorter tubs. Anyone tried this before? Or can anyone think of any issues with this plan? Thanks in advance.