According to the SRC, Tilapia do not feed at or below 63 degrees so that is indeed a surprising result. The B/A pictures are dramatic. I wonder if you had a major rain event during that week? Sometimes that will temporarily get rid of the algae also.
Regardless, now that they are ahead of the algae, you can kiss it goodbye for the season, in my experience, as well as the need for chemicals. Great pictures!
