Are these black bugs

[ak4890]

Hi Everyone,
Have a bunch of reasonably established montis in my tank (been around for 4 months or and showing growth), with one acro and a couple of gonis. Montis seem to have had a nudibranch infestation, and while dipping them (in RedSea DipX), I noticed that there were also some black dots moving on them. This is what they look like under a microscope — are these black bugs? I've attached a video of the nudibranchs too FWIW.

 

[Zyk5280b]

Monti eating nudis in the video. You can see them towards the merger of the white/orange skeleton of the cap. No in tank treatments I think still?