I have 150MH and 2x18w CF and my tank temperature stays consistently between 77-79 degrees.
I did install a small cooling fan in the rear and the hood has 2 internal cooling fans to exhaust the heat. The light is 1" from the surface.
Most of the heat problems on the RSM come from the huge, inefficient, useless skimmer they put in it. It is a massive beast of a skimmer that never in an entire year produced the amount of skimmate I have extracted using a Sapphire Aquatics BC29 with the ity bity RIO RJ600 pump in the past 2 months. Before removing the old skimmer pump I could never keep my temperature under 80 and was constantly sitting around 82 degrees or warmer.
It is a very nice tank aside from the skimmer.
-I just ordered the 130D today, one of the things that convinced me to get it was some excellent reviews of the skimmer that I read elsewhere.
I am curious, do you have the "D" or the original?
Thank you,
~C
Here is a current picture.
Regards,