so i still lost about 4 ppm overnight so obviously i haven't gotten rid of the algae, but the pool is definitely looking better. i guess this is one of those situations where the FC level i had was just doing enough to fight off the algae, but at some point the algae just blew up. to go from no overnight FC loss and no cloudy water to what i have now was pretty quick. thanks for all your help, i'm hoping i have this taken care of by the weekend!