Weird Organisms in Tank

6erikar9

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Hey guys, I made an account just to ask this question because I have no clue what's up with whatever is swimming around in my tank. There are multiple of varying sizes, they seem to be about 1/8th of an inch.
DD56F1CC-BD4B-4FAB-98FA-6443975C2F1D.jpeg


This is what it looks like, it's a horrible photo but they don't come up close. They swim frantically, almost like jellyfish, and have thin tentacles under each white dot. That center white dot extends from the body. I don't mind them being here, but it would be cool to know what they are. I did happen to start this tank with live rock from a LFS. Any help is very much appreciated, thank you.
 
Ah, alright, thank you all so much. I figured it was hydroids as I have other stages of their growth occurring but since this is my first SW tank I had no idea.
 

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