So I had mites about 2 years ago. I cleaned everything, got new sand, and gave all the hermit crabs baths. Today I noticed a few mites in the cage. They weren't as bad as last time, there were not on the hermit crabs. They are white and look kind of like walking sand. I was wondering if they were harmless or not. I have never put fruits or vegetables in the cage and I dont want to freak out if they are nothing. Im also wondering how I even got them In the first place.