I added an initial dose of polyquat (12 oz) last night and my FC was at 1 ppm tonight. Today was cloudy an I got about 2 inches of rain. My FC normally doesn't drop that bad with rain. My CYA is at 40 and I've been maintaining a FC level of 5 ppm. Lately, I've been loosing 1 to 1.5 ppm per day and that's with 10 to 12 hours of sun. Is it possible the large dose of polyquat killed by FC or is this a sign of something bad to come?
I'll be raising by CYA in a few weeks bc I get so much sun and I'm always fighting algae.