Strange things on my rock please help

[Yank]

These keep coming up on my rock. I am not sure what they are and if they are harmful to my coral? Any help would be appreciated.

 

[bradleym]

They are colonial hydroids. They will bother corals if they are near them.

 

[EeyoreIsMySpiritAnimal]

If possible, pull out that rock and chisel off the hydroids.
If there are patches all over, then do a search for colonial hydroid treatment.
They sometimes go away on their own but can also become a problem, so nipping in the bud is a good idea.

 

[Yank]

They are colonial hydroids. They will bother corals if they are near them.

Thank you very much

 

[Yank]

If possible, pull out that rock and chisel off the hydroids.
If there are patches all over, then do a search for colonial hydroid treatment.
They sometimes go away on their own but can also become a problem, so nipping in the bud is a good idea.

Thank you very much I will search that thank you again.

 

[vetteguy53081]

These can and may sting and also multiply. Best way to stop them is to direct water flow towards them- NOT at them so that they cannot capture food and will eventually starve.

 

[Yank]

These can and may sting and also multiply. Best way to stop them is to direct water flow towards them- NOT at them so that they cannot capture food and will eventually starve.

Thank you I will try that