Be sure you have a way to vent thru the ice for a day or two minimum if you have had problems before.If your concern is the area refreezing too fast before the hydrongen sulfide has a chance to gass off your concern may be valid. Not sure if the rapid startup on your aeration system was a problem due to pumping low DO water to the surface or putting gasses in the water column too fast or both. I would be intereseted in the particulars on that if you dont mind.If thin ice is not a problem and you have one of your diffusers in the general area you can turn one or two of those on if your air temps are not extremely low.