Now that I think about it, it looks like bubble algae. If it is then prepare for battle. Use emerald or ruby crabs or rabbitfish or juvenile emeralds(one per handful of algae)
Now remove the algae manually also. And carefully. Before the bubbles burst and spread spores throughout the tank and make it harder to flush out.
Also for extremes, use a UV sterilizer as well. But if you do so prepare to dose your tank with Seed bacteria as well because UV sterilizers kill all bacteria and algae spores.
If you're running a refugium then double check to make sure that there's a copeopod population going on in there. They eat up lots of micro sized particles as well that could be causing a bacteria algae break out. If you don't have a copeopod population in the refuge then add some fuge mud or sand or LR rubble to the bottom of the refuge and stop flow to the refuge and add some copeopods to the system with some phytoplankton to feed them. Should be able to pick that up at your LFS.
Wash rinse and repeat. Try and keep the algae from smothering your coral. Also watch your PH like a hawk. These algaes love O2 and will devour whatever is in the tank for O2. Consider increasing your tanks dissolved O2 if the pH drops to much.
That's all I got for now. Good luck man
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