Pretty sure it's not algae. I unknowingly did a OCLT test last night and my FC level remained the same.
Last night 8:30pm
5 ppm FC, 0 CC
300 ppm CH
7.7 pH
360 TA
and then these numbers from this morning in post above
5 ppm FC, 0.5 ppm CC
300 ppm CH
8.0 pH
340 TA
30 cya