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The baffle area is 80mm Length x 80mm Width. Basically the bottom of the Rollermat contraption would have to be 80mm x 80mm or smaller.

So I am really new to this whole thing and live in AZ. I put a heater in each of my tanks and just got an extra thermometer to double check the temp. I have a 20 gal QT tank and a 140 gallon DT. The temp has not been below 83 Degrees F. Am I going to need a chiller? Will my fish even survive...