I don't know too much about them other than they are beautiful fish and that they hide alot. In the book I have it says they prefer dark places and are rarely seen in the open. I've certainly never seen one diving here in Florida and they are supposed to be a local fish.
We had a few in at the LFS I used to work at from time to time and they always hid. Just make sure he is getting enough food. If you have to feed him by hand or with a baster or something. That could help.
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