Zoanthids not opening, please help

[salt0727]

My zoanthids had been doing great for some time even growing but for some reason have not opened. Nothing seems to be irritating them. I can see some brown spots on some of them so im not sure what it could be. Any ideas?

 

[ratsckor]

When was the last time you did a water change? What are the levels in your tank.

 

[gr3]

I agree check water parameters.