I no this was the perfect time for you to post this and i hope it is a cure to. I now that my Zoa's hate this Dino if any Dino is on any Polyps they will not open up at all.
I have dipped all my frag discs with zoos to get rid of hair algae and it works wonders on the that for sure.. I actually filled a bowl with peroxide and held the frag in my hand where it was submerged just enough to cover the disc but the zoo was out in the air.... It only takes about 30 seconds to kill off the hair algae and your good to go...