A good ABG mix can last for years.
I got lucky and found springtails in with my Ts.

I think a good layer of dry leaf litter would work well with a snake.
What type of snakes are you working with?


On a smaller scale, I can keep my substrate moist on the bottom and pretty dry on top. This allows isopods and springtails to live.

In my native frog, salamander and toad tank. I have 1/3 ABG type of mix with moss for a top layer, 1/3 bark and 1/3 rock. I have isopods, earth worms, slugs , snails and B. dubia keeping things clean and keeps everyone fed.

Building a gradient or rock ledges will help allow the snake to chose a dryer spot while keeping your clean up crews happy.

Check out some of the Dart Frog boards. Those guys love this type of stuff.

I'll get some pics later on today.