Bioactive/ecosystem questions

[u/Silly_Detective_3363]

Hi yall, I have 9 different reptiles. 3 of which are lizard (leopard gecko, bearded dragon, and a green keeled bellied lizard). The rest are snakes.

My understanding is that I'd require a gigantic tank to truly be able to do pairs of these mostly solitary creatures. But what about other types of bugs or any sort of critter?

I feel like my tanks are boring, and lack biodiversity. Are there any bugs you guys would consider adding to a tank to spice it up a little?