What's bothering my Zoa's??

[taima1shu]

For the past couple of weeks, I notice some kind of stringy algae has been smothering my zoas. Any ideas what it is??

The tanks been up for almost 2 years. The parameters are steady
Nitrate: ~5ppm (Salifert)
Phosphate: 0.028 ppm (Hanna Checker)
Alk: 7.3
CA: 410
Mag: 1350

Thanks for the help!!

 

[BrianPoni]

Do you have vermatid snails in and throughout the zoa garden?

 

[taima1shu]

Do you have vermatid snails in and throughout the zoa garden?

Not that I can see. I'm pretty careful to inspect for vermetid snails when introducing stuff to the tank.

 

[DharkaronReef]

That looks like some red hair algae. Maybe try using a turkey baster and blow them off.

 

[taima1shu]

That looks like some red hair algae. Maybe try using a turkey baster and blow them off.

I try to blow them off once a day, but after an hour or two, they just grow right back. I do try to clean the whole rock with a tooth brush once a week when I do water changes, but that doesn't seem to work either