I know absolutely zero about inverts but I can imagine you'll hit some snags trying to keep scorpions, tarantulas, and ball pythons all in the same type setup. It isn't just about being able to provide temperatures, what about humidity? Ventilation requirements? General size of the enclosures? Do your tubs have lids, and if not what does that mean for a spider that may build its webs all around the tub? There are a lot of species-specific husbandry points you'll need to work out before trying something like this.
Just my two cents, like I said I know nothing about inverts.
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