What's on my zoas?

[Fishfinder]

this little hairlike stuff on the stalk of my zoa colony. Any ideas what it is? I just noticed it within last 3-4 days

 

[Tahoe61]

Sorry going to need an image more in focus..

Based on your post a few possibilities are:

Algae, could be green hair algae or byropsis.
Could be hydroids.

 

[Fishfinder]

Yep that's it. Hydroids. Thanks for the help. Will peroxide kill them?

 

[Mariners]

Depending on the type of hydroids. The white ones usually go away after a few water changes and if u dont have too much nutrients. The brown ones or colonial hydroids are worst then aiptasia and spread quick from photosynthesis and nutrients--short of boiling them in water, they dont die.