How to clean off algae from coral?

[Sick_man]

Hi all, my rasta zoas are not opening fully. I noticed this with my vamps in drag zoas so i used a turkey baster to blow it and it closed but 5 mintues later it opened fully. I figured there must have been crap or gunk on it. I did this to my rastas but they opened just a bit more but not fully. I think there is algae or something growing in the middle of the frag so how do i get rid of this? I do not have any coral dip at the moment.

 

[Daddy-o]

A dip in hydrogen peroxide/tank water.
Cheers! Mark