90 gallon pets?

If you want something that won't need UV light, you could probably have a pretty sweet setup for either a few crested geckos, or a few leopard geckos (either all females, or adults with one male and 2 or more females), or a luxury setup for one crestie or leo.

Cresties are arboreal, they need low temps (like, standard room temperature, usually), high humidity, and lots of things to climb on. They eat mostly crested gecko diet (Repashy is the usual recommended brand), which is sort of a fruit paste, though they also like occasional insects (usually crickets or roaches)

Leos are terrestrial desert critters. They need ~85F on the hot side, a non-particulate substrate, a humid hide, and insects to eat (preferably crickets or roaches, though mealworms can also be used).

I think most other lizards need UV light. I know both bearded dragons and anoles do.

I have no idea if frogs need UV or not.

Hamster, they don't need any lights or heat as long as it's not to cold or hot, plus it's needs to breath so as long as air can go though it will be fine and a hamster would love it. But you didn't say anything about hamster but it's the first thing I thought of.

a bearded dragon could live in a 90 galoon tank.

bearded dragon,

maybe a bunch of anoles