thx removed lights from niche & cleaned with brush were dirty with slime, brushed and vacuumed. added chlorine up to 24ppm
Your CC's seem low for the amount of chlorine being used up.
Thx swamp woman I agree. I was meaning with accepting the fact that I may not get <1ppm overnight & I may need to accept a maintenance of FC:4-7ppm with CC: .5 and a greater than > 1ppm loss overnight.