Amphipods?

[Angryminer_07]

What are these guys? My guess is amphipods. They seem to be everywhere.

 

[Angryminer_07]

Another crappy video with blues off

 

[CMO]

If you can get a good close up still photo that would help but yes I'd agree those look like amphipods from what I can tell. I have a ton of them.

 

[Maritimer]

Could also be munnid isopods. Amphipods tend to be flattened side-to-side (laterally), while munnids are more top-and-bottom (dorso-ventrally) flattened.

Both are good to have around!

~Bruce