Alex,

I sent my wife to get a couple of them yesterday. I had to shut my MH off today because of temp. It was up to 85. When I get my new pump hooked up it should help a lot.

Another thing I would suggest that you take into consideration is that you are measuring your temp in the sump. The temp of the aerated water in the sump will probably be 1-2 degrees cooler than in the tank.