hm.. I'm in a rush, I have to go to school in 5 mins but I'm trying to figure this out poor Julius

Just by your description, it doesnt sound like he's physically ill. It sounds like something might've scared him ~ any changes in lighting, temp, or arrangements? Is there anything sitting near his tank that might startle him? Is he having any trouble swimming to the top?... if he's at the bottom a lot, and he swims crooked or has trouble swimming, I would think its a swim bladder problem.

For now, just try giving him good food (maybe some pea in case he has tummy issues), keep him in a dimly lit, quiet area, and maybe change his water and add extra Stresscoat. ~_~ good luck, I hope Julius is back to his old self soon!