I'd go with shoebox containers from thecontainerstore.com for hatchlings. 28qt sterilites for small adults and 41qt sterilites for bigger adults. As far at how many hatchling tubs you want, I'd go with 'more is better' because the variation that is possible from 5 clutches is very great. Seeing as the average clutch size for a ball python is around 4-12 eggs your needs for hatchlings varies from 20-60tubs(at the extremes)...personally I would go with no dividers between hatchling tubs simply cause I dont know how to do it..but if you have a carpenter handy then I'd say go for it! lol. I have/plan to have different racks for each size of tub..just cause I think it is easier, partially because I use/plan to use different styles of heat for each tub(4" back heat for hatchling tubs, 4" belly heat for 28 qt, and 11" belly heat for 41qt). Hope this was helpful.