We have some naturally occurring in the frog Viv as it's the only one with soil.
The setup is a short China cabinet that's been converted. It has a glass front that's about a foot or so deep which has a peekaboo pond with soil around it, so there's a layer slice effect.
We can regularly see isopods and other greebles in the soil where the frogs can't reach.
The Viv is fully planted and well established. We occasionally try something new in there and they tend to come in on the plants.
We've not gone out of our way to buy any (not sure you can here), but they are the tiniest of decomposers. We've tried rolly-pollys, but I've not seen them establish, but it's definitely bioactive - have had it for years and never done more than water and top up the pond.
This is from when I first set it up, just cause I realise the peekaboo effect is kinda hard to visualise when written down:
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Nowadays, it's much more overgrown and I really need to trim back the tradescantia. None of the ferns I've tried have ever taken. There's a Moses cradle, rock orchid, air plant, bromeliad, spiderplant, tradescantia, climbing fig and some groundcover I can't recall the name of. We've added a nice driftwood to give them some climbing areas.. oh and duckweed in the pond. Various algaes are in there and we get the occasional fruiting mushroom, but remove them so they don't make it to spore. Theres a screened hole drilled on each side top for ventilation and a computer fan on one of them to keep the airflow going. A bright central light is a must for the plants and we've gone through a few. First was too dim, and second died around two years in. There's a short led batten in there now.
I'm a bit less picky about the plants I put in there, since the frogs don't eat them, but know quite a few reptile-safe ones. We were quasi bioactive in the water dragon Viv when we had her. It had a coconut coir floor around its pond and some had definitely broken down to soil when we cleaned it out after her passing, but I didn't necessarily see any decomposers in the mix.
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Sneaky lil frog.
