I would leave off the aerator when a cold front is gonna come thru. That will leave the shallows to warm even on coolish days. I doubt an O2 problem this early in the year unless you have high biomass.
Listen to me, with the FA I am starting to have, I would have started the aerator, but the little compressor is DOA. It has been 80s the least few days, but with cooler weather coming, I am glad it is broken or I would have probably turned it on and left town.
