Black mass on Zoa

[Steve1500]

Hello,
YesterdayI bought this zoa from my LFS and I saw only one of these black masses on it. I did not think anything of it but today there are several of them. Anybody know what they are and should I be concerned? Also, this zoa is not opening up completely....I just acclimated it yesterday so that may be the problem but I also bought another zoa and it is opened.

Thanks,
Steve

 

[DSC reef]

Looks like black sponge. You should be able to remove it with tweezers

 

[joshporksandwich]

Hello,
YesterdayI bought this zoa from my LFS and I saw only one of these black masses on it. I did not think anything of it but today there are several of them. Anybody know what they are and should I be concerned? Also, this zoa is not opening up completely....I just acclimated it yesterday so that may be the problem but I also bought another zoa and it is opened.

Thanks,
Steve

Remove them with tweezers. I don't kniw what they're but i get them all the time. They're harmless but will outgrow the zoas and kill them