I think sandwich containers work great for corn hatchlings. I have a rack full of about 50 of them and I bought little water dishes that have room under for a hide from the pet store.(thoes were .99 ea, but will last for ever and are easy to clean) I have found that they can get pretty smelly fast because they are small, so make sure you put a lot of ventalation (drill holes) in them. For some ,the toughest part may be finding water dishes short enough to fit in them and or hides. I use my hatchling rack mostly for problem feeders and high end morphs, otherwise I group them in critter cages from wal mart ($9ea), so they have more room to move. I don't like to keep them in the racks for too long, but it's room enough for a small 8-10" hatchling for a month or so. The other problem for some with the sand. containers is how to heat them. I have a temp.'d room so I don't have to worry about it. I am not sure, maybe heat tape would work, but I would be nervous with such a small surface area that it would get to hot. Good luck with the hatchlings!