Jumping spider mites

[papillon251]

I have Marpissa muscosa slings and as I was taking pictures of them I noticed that some of them have mites.
They look like fruit fly mites and I did feed them with it.
I always remove food from their enclosures and clean it every two days.
Does anyone know are they harmful to spiders and can I get rid of them?

 

[LeighR]

I am having a similar issue, were you able to get rid of the mites?