What is this ?

[Surfandturf]

This keeps growing on my zoas even after treating with vibrant.

 

[Tahoe61]

Looks like a Turf algae. Manual removal and scrubbing with a soft tooth brush, you could try some hydrogen peroxide by applying the solution to the plug and avoiding the zoanthids/or palys by using a Q-tip. If it's Turf Algae is will spread.

 

[fragit]

Better photos would help with an ID. Looks like this to me... Gelidium, Red Wiry Turf Algae. Sourced from reefcleaners.org, here is the link, http://www.reefcleaners.org/nuisance-algae-id-guide. Calling @twilliard, or @Lionfish Lair, they maybe able to better help ID this for you.

 

[Surfandturf]

Thanks for the site! Can't tell if its the red or green. I will pull it out scrub it with a toothbrush and apply peroxide to it.