Usually, the holes are the size of the soldering iron.The best way to hole tubs.
Stacking free-standing tubs is doable, but a hassle and a half since you have to unstack them to open them.
The best bedding in tubs is newsprint and aspen.
Here are a few pics of some of my tubs.
My homemade rack:
15qt juvi tub (corn in residence):
'Large' size sub-adult tub:
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