I've had frogs in the past, Dends and Mantellas but am noticing something wierd in my vivarium "EARTHWORMS". they are very small about 1/2" long and are definate earthworms, I was just wondering if I should be concerned at all by thier presence. I've had tanks in the past and never saw a single worm. I am also seeing very small snails like bush snails as we would call them in the Orchid world, I just want to make sure my 4 Mantella Madagascarensis are not in any danger, eating them or causing any harm in general. Stupid question I know, but I really want to make sure they don't pose a threat, if they do I'll re-design the Vivarium and set in new soil on top of the falsse bottom. Any suggestions are welcomed.