Sounds pretty good Only thing I would change is make sure the hides are all very similar if not exactly the same. For a tank that size 3-4 would be good for a young one. You want them all the same so they don't have to choose between feeling secure and thermoregulating. If they feel safer in the cold size hide they may stay there instead of going to warm up if they don't feel as secure in the hot side hide and vice versa.

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