Tiny. Size of pinhead at most

[LeakyBrain]

Wondering what these tiny critters are, and if safe or not.

 

[corey01]

hydroid jellyfish. I have never heard of them being detrimental in a reef tank. at least in any of my tanks.
Is this a new tank? seem to see them a lot in newly established tanks and then a lot of the time they will just go away on their own.

 

[Krzydmnd]

Hydroids. They don't typically stick around too long at least in my experience. I don't think they are problematic unless they get to infestation proportion.

 

[LeakyBrain]

Yes, new tank 2months old. Not too many of them at this point.