The swimming in circles against the glass I've found is a sign of stress. Normally I'd say that this is because of your water parameters, but he is brand new and that could be the cause.
Still, check your water. Ammonia and no2 should be zero and no3 should be no more than 20. I've found that ATF tend to do that circle glass spaz thing (I know exactly what you're talking about) when no3 gets above 20 or anything else gets above 0.
EDIT- Also, a moon light is critical when they are smaller. It REALLY helps to control what I call night terrors. If your main lights are on, leave them off for a day or two with only the moon lights on. Also, I suspect that he's not calm when you're at the tank; I rather expect that he's just more worried about watching you than trying to do the circle spaz.
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Who has moon lights on their tanks lol- get real
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