I'm planning a snake rack and, from what I've read, a lot of breeders move their BPs from a 15 quart into a 32 quart when they reach 1000 grams. I was wondering what the rule of thumb is for colubrids? Would I go more by length?

I have a 16" MBK that I'm thinking would do best in the 15 quart, and a 25" pine snake that I'd probably put directly into the 32 quart. Does that make sense? Do colubrids do okay in tubs, as active as they are? I feel like the 15 quarts are a bit small, but I need all my tubs to be the same height, and the Sterilite ClearViews seem to be the only ones that're standard.