Zoas not opening?

[colesjensen]

My zoanthids haven't opens for a while and there is a weird black thing by it. Do you know what it is and what is going on?

 

[kareemkamal3]

Do you have any other zoanthids and if you have, told me that it was open or closed ?

 

[colesjensen]

Do you have any other zoanthids and if you have, told me that it was open or closed ?

I do have others and they are open

 

[kareemkamal3]

Put it in Ro water without salt for one minute and return put it into your aquarium will open