Small insects in media only

[Floradora]

I have noticed many many very small insects in my orchid medium, first in regular orchid bark mix then also in sphagnum moss ..they seem to confine themselves to the media and not travel to the plant itself or disturb the roots . They don’t fly or jump.I am contemplating using malathion but would like opinions on just what they are and how worried should I be..every orchid is affected (about 40) I have a video but I’m unable to post it for some “security” issue..which is extremely frustrating as I’ve been trying to get answers from this site for weeks.