i usually just use oak leaves. ive used the charcoal and siphon method, just knocking charcoal together, done the same wiht slate. i like the cardboard idea, but i think for now ill stick with oak leaves.
what i normally do is have oak leaves on the surface of the soil in my cultures. i usually dust them with vitamins, FF media, or fish food (sometimes all three). whenever i want to feed i just grab a few leaves and toss them in.
im constantly adding leaves to the tanks anyway, so why not have them covered in springtails. the frogs love the added bonus of leaves in their tank. and, in any tank ive had a large population of microfauna, it was mainly in the leaf litter.
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