Also, do you have a fuge? If so do you have calerpa? If you have calerpa, dump it, it is bad stuff IMO. Go with chaeto. Calerpa can sex if lights arent on 24 hrs. and release a bunch of toxins and nutrients. This is off topic, but it is something that can cause algae outbreaks IMO. Anyone else ever observe this with calerpa.
-----Also, gettting a Naso simply for removal of bubble algae is preposterous. Why get this fish(huge) for a 90g if you dont specifically want a Naso just to have a Naso. Thats like getting a .50 caliber Desert Eagle to shoot a squirrel. Your PH is just right, and if you have good test kits then you probably stil lhave trace levels of phosphates and nitrates(bubble algae doesnt need hardly anything to grow). When you move, clean the rocks thoroughly, leave the tank fallow with just emerald crabs for a few months(no fish), therefore no more nutrients and use manual removal. Just keep that elbow grease going, nutrients down, and be patient.