As far as temps go it depends on if you have a brazilian or columbian rainbow boa. Columbian rainbow boas like warmer temps than brazilian rainbow boas. Temps around 85 would be good for either type. I would consider switching to a different substrate such as cypress mulch. With the high humidity requirements of rainbow boas, aspen will more than likely begin to mold due to build-up of condensation within the tub. Cypress resists mold very well and retains a good amount of moisture to keep humidity within the proper range. It's also an excellent substrate for snakes that like to burrow.
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