its just another variant you can add to the frogs diet, its a good idea to seed the tank with some before you introduce the frogs, that way there will be a reproducing population that your frogs can continuously feed off of.

there is a lot of ways to culture springs, charcoal works, so does dirt, sphagnum, peat, pretty much anything organic. you can feed them veggies, but they really relish mushrooms.

you should check out dendroboard.com, this place is dead
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A room of herps.
www.freewebs.com/kapoktree