I am currently setting up some tubs. What I will do is once I get them stabilized, Sunday morning when I get off work, I will stack them on top of each other and see what kind of results I get and post them. For now, I am thinking that if all of the UTH's are on the same end, and each one is on it's own t-stat then each heater will shut-off once it reaches the desired temp, whether the heat is coming from itself or below. But I will try and find out...
As far as the caging is concerned, you can always call or e-mail the manufacturer and ask them, but I dont think it will be much of a problem, as long as each cage has proper ventilation...
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