Small red mites in substrate

Hello! I've got a few large dynastids currently pupating, and I opened up their containers to check on the moisture level, and I noticed these tiny, dark red mites on the underside of the lid. Most seemed to be dead, but a few were moving around. They aren't like any mites I have seen before, they are dark red, kind of shiny, and the legs aren't visible, which rules out red spider mites I think. Could somebody help me identify these mites, and let me know if they are a concern? If so, i will relocate the pupa to artificial cells as soon as I can. Thank you!

 
Thank you for letting me know! After looking into it more, that does seem to be what these mites are. Rounded, hard-shelled little mites. Good to know they are harmless, certainly a relief.

 
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