I would personally keep the lights off in that tank. That will help make him feel more secure. Some sort of decoration may also help to limit the stress. Daily water changes with salt is a great idea.
I am worried about the crazy swimming, looks like he is having swim bladder issues. If possible keep the current as low as possible.
I am worried about the crazy swimming, looks like he is having swim bladder issues. If possible keep the current as low as possible.