Im thinking since I drained pool and refilled, the new water had some metal in it.
Alot of the mustard algae is gone. Finally.

Temp was 80. back to 74 this morning.
readings from last night are from a pool store. Ran out of CYA agent.
CYA 27
TC 6.5
FC 6.1
PH 8
Adj Total Alk 148
Hardness 252