found these in the external face of my filter locks - Good or Bad baby-critter ???

[road102]

They are super small, I think it is some sort of baby 'something' nesting in my filter socks...
Any ideas?. I've seen some bristle worms in that area but I remove them all the time and they look different

thanks!

 

[EeyoreIsMySpiritAnimal]

Possibly small chiton.

 

[WheatToast]

@ISpeakForTheSeas
These almost remind me of those flattened isopods like sand skaters (which are very diverse):

“Sand skater” isopod (Sphaeromatidae/Serolidae). These "pods" are harmless scavengers:

 

[ISpeakForTheSeas]

Yeah, almost certainly an Isopod of some variety. I can't say for sure from the pic, but I'd guess a Serolid (Sand-Skater) species, though the tiny eyes on these specimens would be very atypical for the family.