Prot
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Many thanks for the detailed answer.Answering your question do you need to give Thyroid hormones for the rest of its life? The answer is no.
After metamorphosis in tiger salamanders thyroid hormone falls to undetectable levels. Thyroid hormone given continuously will increase the metabolic rate and shorten its life. There is a suggestion that thyroid hormone levels may rise briefly associated with breeding but for most of tiger salamander's adult life there is effectively no thyroid hormone in their blood.
If old large adult axolotls are artificially morphed the result is usually a sickly individual but if morphed at about 150mm, the same sort of size tiger salamanders naturally morph they are often hardy and long lived individuals.
Get conditions right and it may live well beyond three years. They cannot regenerate injuries like un-morphed axolotls but are still often hardy. Give it a terrestrial tank but I find my morphed axolotl still likes to spend a lot of time in a shallow weed filled bowl of water rather than burrow, so I recommend allowing it access to shallow water as well as burrowing material and land.
I use as a substratum a coco and a few moss. As a reservoir I use a ceramic bowl filled with pure water. But I have noticed that to him isn't pleasant to spend much time in water, sometimes he comes into water but after that at once leaves and long sits on a land.