Shrimp looking bug in aquarium

[r1c4y]

I just spotted a shrimp looking bug maybe pest or amphipod I'm not sure about it and a small spiny looking worm with a slightly red end would be great if someone would help ID.I've attached a video but isn't all that visible.This was taken after the lights turned off.

 

[SaltyT]

Yep, the critter in the video is an amphipod and the worm in the pic is a bristleworm.