I have the c serpents 8 tub short rack, like that it will hold 3 of the smaller vision tubs in one shelf for hatchlings or the single v35 short for yearlings. Currently it's got 2 males around 400g and couple females in same size range, once they hit 800g or so I bump them up to v70s. For a collection similar to your size I think one of these plus a 5 or 10 V70 to hold all full size females and larger males would get you by for a few years.