pepper like bugs on robert's delight

[april]

I have just noticed what looks like moving black pepper on my Robert's Delight. They are only on the roots (free flowing) This particular vanda has old algae (I bought it last weekend from a greenhouse environment) on the roots. I have tried with magnifying glasses to identify the bugs but they are sooooo small that I cannot see anything but a teeny, tiny round black beetle like bug that moves around the root system. Does anyone have any ideas as to what these are and whether or not my vanda is in danger? I hate to use anything if I don't have to. She is in full (and I mean FULL) bloom!