Need help identifying this small white bug in roots

[Manu]

Hello everyone! I've been reading this forum for a while but this is actually my first post!

I hope someone can help me identify what those small white bugs are and if I should be concerned and taking some actions.

First of, I've noticed those bug in all my phals today. The plants are in great shape, leaves are nice and firm with no apparent pests and are all pushing out spikes. Roots are also in great shape. The plants are potted in glass vases with plenty of drainage using lava rocks at the bottom then corse western fir bark, charcoal and perlite mix with some new Zeeland sphagnum Moss on top and in the core. I water and fertilize when needed. The plants are really looking great. I'm suspecting it's been present for a long time but I've never noticed. They seem to only show up when I water my plants as I already can't see them anymore and it's been 1 hour since I watered.

I've attached close up pictures of the bugs. Hope it's good enough. Also a picture of the plant to show the general condition.

Thanks in advance for your valuable help