What are these guys?

[Kuhn]

Found little isopod-looking guys in my Chaeto as well as on my live rock. They seem to come out at night.
They look too big to be copepods... so what are they? Should I be worried?

 

[DaJMasta]

Have a look at images of amphipods or munnid isopods in aquaria - likely candidates and harmless/beneficial.

If you want a better ID, a pic or video is going to be needed.

 

[Kuhn]

Some reason my video didn't post so here's a new one

Have a look at images of amphipods or munnid isopods in aquaria - likely candidates and harmless/beneficial.

If you want a better ID, a pic or video is going to be needed.

Some reason my video didn't post

 

[Kuhn]

Not sure why my videos aren't posting. Here is a super short one in hopes it'll actually upload this time

 

[Kuhn]

Some reason my video didn't post so here's a new one

Some reason my video didn't post

Looking at images of amphipods, it looks to be exactly that.
Thanks!