It could be from stress (of the move). There's really no disease or illness that has a symptom of turning black. With the sturgeons at my work, they have black spots when they get stressed. If you start a new post with this problem, I will promote it so hopefully someone with puffer experience can assist you with your problem. If I promoted this post, people wouldn't see this part because they usually don't read the whole thread.

In the new post, would you please tell people the water parameters, and how long it's been that you have had this little guy?
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Phishie

"An ounce of prevention is worth a pound of cure."

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