I'll do the OCLT again tonight.

From 7/22 to 7/27, I've kept the FC above 20.0, letting it drift back down on the 28th. On the 28th, 29th and 30th, I conducted the OCLT and lost 1.5 ppm each night. I always got to the pool around 8:00AM, but the sun had been hitting the pool for an hour or so at that point. I guess I didn't kill it all.

Thanks! I'll keep going.