so only running your aerator at night does the job?
It works for me, with one 1/2 acre (12 ft deep) and one 2/3 acre (9 ft deep) ponds. Realize that my "at night" is currently 8:00 PM to 10:00 AM and gets expanded to 16 hours/day in September - all during the coolest hours available.
YMMV.