Bulldog - Yes, as other members noted you should be fine with adding snails or hermits (or both) from the water's potential toxicity aspect (i.e., your ammonia and/or nitrite levels have fallen back to zero).
However, one thing to consider with respect to whether you add snails/hermits and how many is that your tank at present may have very little food for them to eat. Neither type of critter is known to eat diatoms, so until your tank grows some red/green algae or you add fish that you're feeding, you may want to consider actually feeding the CUC. For the snails, dried seaweed (nori) from the supermarket would be suitable, and for hermits, a little bit of flake (or preferable) pelleted fish food would work.
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