Sandy is right, you have to have a carbon source and something that will act as the bedding for the worms. I use a lot of coconut coir in mine as bedding and a carbon source.
I do crush the egg shells but only because I have heard the worms are aided by having some sort of hard particle they eat and use to grind up their food in their stomach.
I have started bins with nothing but cardboard, newspaper and egg cartons without adding anything to the bin for 2 months. The worms worked everything although it was slower than the bins I added scraps to.
The worms will not have anything in them that is going to harm the frogs or other pets unless you put it in there. The particle size is so small that impaction shouldn't be an issue with anything the worms would normally eat. Paper material is eaten when it has started to break down from natural bacteria and molds.





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