I dont have hatchling racks becasue the tubs are too darn small. I think about it this way. What if you have babies for 6 months? Babies are ferocious eaters and get big fast. Shoebox is the smallest I go with tubs. Before you consider getting hatchling racks ask yourself how many babies you plan to have and how long you can keep them if they do not sell right away. Then you will know what size you should get.