What is this

[El ingeniero de la letra]

They are growing out of no where they look cute but I have to many already how can I get rid of some without spreading them

 

[Brad Waddell Wrath's Reef]

Looks like Hydroids, I hear they go away after awhile. I am not 100% on that.

 

[fishguy242]

hi look like hairy mushrooms

 

[samnaz]

Ball anemones?

 

[vetteguy53081]

Majano anemone - No good

 

[Sashaka]

+1 Majano. Majano looks a lot like aiptasia except it has short tentacles.

There is an outside chance it could be a jewel anemone too. It looks to have enough tentacles, but they are usually quite pretty and often brightly colored..hence the name "Jewel" anemone. We don't see them in my neck of the woods.