I bought a bala shark about a week ago,he seems overly energetic and happy but then again...he seems like he's constantly looking for something....does he want a school? or will he be content to just hang out with the other fish? He's eating fine,but swims close to the walls as if he enjoys the company of his reflection (or racing it ,whew he's fast) Any suggestions? I'll gladly buy a few more ,they're super cute but I was certain he'd be content alone