What are these?

[Paisley Rain]

Can anyone identify what these little critters are that were hiding in my filter media? Assuming a species of nudibranch? I had put two berghias in the tank months ago to try and get on top of an aiptasia infestation, but haven’t seen them since and am losing hope. These guys don’t look like the berghias? I could be mistaken of course. Any help would be much appreciated!

 

[Gumbies R Us]

@ISpeakForTheSeas

 

[rayadog]

Color for me is throwing me off but they could be tiny bristleworms.