That's a great pic. Now I can read your palm and predict your future.....

I predict clear water ahead! LOL
I was going to mention that myself! If anyone has palm reading experience, I'll take the advice.
Seriously, I'm not certain? I have been lucky enough not to have algae in my pool...but having seen algae in lakes while fishing, that sure looks like algae....and combined with your FC loss at night, that's probably confirmation.
I was talking to my friend Beave last night, he had an Intex pool for 4 years. Anway, he said the space between the dark blue and light blue, the walls of your pool get really slimy, and needs to be brushed or wiped frequently to keep stuff from growing there. So I'm not sure if you are getting those areas or not, but thought I would mention it.
I've been scrubbing that area too. By hand and with the brush. It's clean as a whistle!
Hit it hard!