Yellow/green algae?

[markrbdr]

I've been noticing this yellow greenish algae starting to grow over my corals. My zoa's aren't opening oh, my acan is getting covered in it along with some other Rock. I did two doses of Dino X. And then I noticed my Favia is now completely bleached or dead. I don't know if the dino X affected that. But it definitely not hair algae. I did. I had on the other day but I don't know if that hurt the favia?
Alk-8.5
Cal-440
Mag-1299

 

[Sean Clark]

Do you know your Phosphate and Nitrate levels?Also, how long has your system been set up and running?

 

[i cant think]

+1 to the above, without that information it’s hard to say for certain but at the moment it looks like a sponge or tunicate of some sort.
Texture would also be great to help.

 

[Miami Reef]

Looks like film algae to me. They will grow over dead coral skeleton, so it’s possible Dino X causes bleaching.

Testing for nutrients isn’t as critical as most people think. Algae gets limited at around 0.03ppm phosphates per @Randy Holmes-Farley

Algae needs light, phosphate, nitrates, trace elements, space, and lack of herbivores to grow. If even one is inadequate then that is enough for algae to halt overgrowth. Contrary to popular belief, more nutrients will not increase growth rates of algae as long as something else is limiting.

Increase herbivores.

 

[markrbdr]

Do you know your Phosphate and Nitrate levels?Also, how long has your system been set up and running?

nitrate was a little high before I did a water change friday. Phos 0.0-0.25. It's been running over 2yrs now.

 

[markrbdr]

+1 to the above, without that information it’s hard to say for certain but at the moment it looks like a sponge or tunicate of some sort.
Texture would also be great to help.

It's also not like a hair algae texture.