Why are they dying?

[ClownFishGuy6]

I have 2 types of zoanthids. I don't know what they are called but they are dying. Could it be all the green algae on the base of the rock that's creeping up to the top? Because my tank also has a very big green algae problem.

 

[zachfishman]

I have 2 types of zoanthids. I don't know what they are called but they are dying. Could it be all the green algae on the base of the rock that's creeping up to the top? Because my tank also has a very big green algae problem.

Your algae issues may be indicative of overall tank problems. Can you post a picture of the zoas and your water parameters?