Thank you kelemvor. I finished with the water refill, adding what bleach I had left to be proactive when I was filling it.

New readings (in daytime sun, mind you) are

fc 13.5
cc 0
ph 8+
acid demand 2
ta 100
ch 220
cya 60 (yes, 60!!!)

So, do I go shock to the mustard algae level of 34 or shock to normal level of 18? What do you suggest? Thank you for your help. I am grateful.