I'm sure it has been mentioned already,
but I second anyone that suggested another hide on your cool side. Maybe try to get one similar to your current.
Also, since your tank is so large, I would definitely try to fill it up with more decoration and obstacles.
May I also suggest, blacking out the back side and both sides of your tank with a dark film or paper of some sort, perhaps a decorative picture wrap from your local pet store. That might help make him/her feel more secure as well.
Best of luck to you and hopefully everything works out, good luck!
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