Well the reason I went with the 11" Flexx is because they say the heat should be equal to 1/3 of the tub and my biggest female is almost 3000 grams and she seems just fine in the 41 qts that I am using. This is just what I made and use to give someone an idea I also have a 40qt rack that I built and works awesome. I really love the fact that I put a work top on that one it really comes in handy!
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