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Ts can go into premolt, and molt without being very fat. Turning black means it's likely in premolt, which can take very long in some individuals and some species.

I have two B. albopilosum now, one that has never even moved any substrate, and one that burrowed from the first day and has been at the bottom of his container ever since, who also happens to be in premolt though it isn't fat and has never eaten in my care. Some will burrow, some won't.

I wouldn't worry to much, these are really hardy Ts.