Mites (not spider mites)...?!

[flowerpower]

Has anyone ever observed very small mites on their orchids or orchid media?

I seem to have these in my growing area and they are not interested in the foliage. They tend to live on dead or dying roots or dead tissue near the rhizome like a sheath etc. Sometimes if a root has algae on it they will be there too. The orchids appear to have sustained no damage and grow normally.

They are tiny, white and when magnified are definitely a mite. They are definitely not a spring tail, they are far smaller. You would actually think it was dust or mineral build up unless you looked more closely and see it move.

I do my best to remove dead tissue or decaying parts from my orchids but I have learned - the hard way - not to be too hasty to start repotting. Just wondering if it's natural/normal or if I need to take some action. Miticides are not really available in the UK.