Hi Boomy, are you talking about the Green Perlite? that may be because of moisture. I've seen that happen when the humidity is to high Or it was in a humidity dome, to me it looks like algae on them, the green. I really don't see any white mold. But That Green is algae. No problem just either mix it in and stir the top of the soil and let it dry out for abit. don't over water her.