Amphipods vs nerite snail

[Girthrockwel]

Not sure what's going on here. I caught a glimpse of something running around my rock tonight so I got some video. These are amphipods right? This snail is about an inch so these amphipods are getting pretty good size. Are they cleaning around the base of the snail or eating him. There were three or four playing tag around and in his base. Also looked like one of them ran across my zoa frag causing the polyps to retract earlier in the night.

 

[GHsaltie]

Yep amphipod, they are good guys. Probably was just snagging/searching for some food that was under the snail.