I'm surely no expert, but I keep some pet millipedes and some isopods in bio-active containers with springtails and for all of these invertebrates I find that I need to keep the substrate quite damp in order for them to do well. I know people have set up ball pythons and other snakes that enjoy higher humidity in bio-active enclosures, but I wonder if corn snakes would do okay long-term in an environment that's consistently damp? That being said, corn snakes seem like extremely adaptable and hardy animals so they may very well be completely fine, but I've always known to keep corn snakes in dryer conditions than I would keep something like a ball python, tree boa, or other more tropical animal. If the enclosure isn't kept too wet and there's plenty of ventilation and temps are always kept in a good range, it might be a perfectly fine home for a corn snake. I'm not trying to discourage you at all, but there's are some of the things I would personally be thinking about if I were considering keeping my corn snake in a bio-active setup.
You can put together a very elaborate and stimulating enclosure with a lot of different hides, branches, interesting substrate, and fake or live (reptile-safe) plants, without necessarily making the whole enclosure bio-active through the addition of live invertebrates. That might be a good place for you to start and you can always add in different substrates and eventually a living clean-up-crew in the future if you decide you want to commit fully to making the enclosure bio-active.
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