FW exit don't have a effect on AEFW.
Nudi branch need a constant source of food, if they consumed all life AEFW you still have the eggs that will hatch after a week or so.
Removing your SPS and dipping them every 5 days in a double dose of Bayer for the next 8 weeks is your best bet.
Remember to remove all SPS out of the DT and also remove the encrusting's of the rocks.
Leave DT fallow of SPS for at least 8 week.
Add some leopard wrasses, yellow corris, Ruby red dragnets or a melanures wrasse.
In my frag tank where I have all SPS as of now I have a bunch of Springerie Damsels, yes they hate each other but they rooming my SPS and picking every worn they can find of there.
Last two times I dipped didn't see any dead AEFW so I think I'm winning the battle.
I'm just 4 weeks in and will finish my eight weeks QT/dip