As long as they're not actually losing weight, it probably IS brumation, and there's not much you can do about that.
Have you ever had them checked for parasites? They can cause poor weight gain and reduced appetite.
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"The serpent crams itself with animal life that is often warm and vibrant, to prolong an existence in which we detect no joy and no emotion. It reveals the depth to which evolution can sink when it takes the downward path and strips animals to the irreducible minimum able to perpetuate a predatory life in its naked horror."
Alexander Skutch

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