My tank got to 87 yesterday because of the heat and lack of AC in my room and started putting ice since...i got it down to 84.5 today but the heater kept fighting back because i was putting the ice bags in the sump...so I turned it off. The temp is now starting to fall more...it's at 84.2 now. How far down do you think it will go and what temp should I monitor it to until I plug it back in?