I have three tanks stacked in my set up, and I easy can scan a six degree difference in the winter from floor to ceiling. I have to keep a close eye on my top tanks, and obviously set the heat lower on the top ones. I know that probably doesn’t help with your problem, just trying to say I relate to what your saying. I remember back in the day hearing breeders having similar problems. Hopefully someone with rack experience can offer a work around or an outright solution. Good luck.
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