I don't have a rack that's really my problem. I've just stacked
the tupperware on some plastic shelves.

Right now I'm using 2 under tank heating pads taped up to a
plastic shelf that is propped up vertically behind the
boxes, but not all of them are getting as much heat as I'd like.

It's not bad, temps range between 77 and 88 throughout the day &
night. I may buy some electrical heating tape and use that
as well. Some of the boxes don't get as much heat as others.
I'm rotating them for the time being until I come up with a
better set-up. It should be resolved (somehow) before I offer
the 1st feeding.

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