What are these?

[monddeli]

I was organizing my wires , so i had to pullout all plugs, including filters and wave makers. 10 mins out these guys shows up, what are they?

Tank is around 6 months

 

[SnazzyUrchin792]

Double post. Other thread here: https://www.reef2reef.com/threads/what-are-thoseeee.1074512/#post-12877435