Add one part saltwater. One part h202. Drop frags in. I've let leathers and mushrooms sit in the cup for 4 minutes. Sps' 1 minute or less.. Might b able to go longer. But you will see bubbling. Toothbrush any seen algae. And drop frag in the tank. Within a day or two the frag will be opening up like normal. I had a finger leather 100% covered in hair algae. And not extending... Scrubbed the crap out of it and let it soak for 4-5 minutes. The next day it was pretty much yelling thank you!!
I would even two parts water. One part h202. Maybe drop it in so it only goes up to the heads. I did that with mine. Just leave it in there for a minute. And if it handles it well. Do it again in a week or two. Maybe leave it in longer. But all algae will die on it. After its been dipped. Just put it right back in the tank
It won't for a little while. But it will come back.
I don't mind the pests.. Most of them seem to b on the good side. It's the 3 million types of algae that show up