I am just getting into tubs myself but i have done a decent amount of research on the topic. #1 is get a feel for the individual snake. Some prefer bigger some prefer smaller. The best i can tell people go up to aprox 500 grams in a 15qt, 500-1500 in a 32qt, and 1500+ in a 41. I am sure more experienced members will chime in, but this is just what i have found in my research.
Cheers,
Bill
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