There is none it's about knowing the animal you have, your BP as a long way to go before being transfered to another enclosure.

At 90 grams I would not consider upgrading to anything before at least another year even than I would not recommend transitioning to a 30 gallons tank but something in between or better save your money get a plastic tub and get a 30 gallons tank when your BP is about full grown.

Full grown BP can spend their entire life in a 30 gallons tank.