Yellow Tang Splashing

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Over the last few days my yellow tang has been splashing violently at one upper corner of the tank, sending water out the hood, and on to the floor. This is happening sometimes twice per day. After having this tang for about 4 years, I am wondering why it has started doing this. Does anyone know about this behavior? Thanks!
 
Mine will do that sometime when the glass is clean and reflective. Tangs are not the smartest and don't recognize their reflection. Maybe he just found a spot where he sees himself really well in that corner.
 
Oh boy! What a mess! There is a blue urchin that hangs around in that corner quite a bit. Would he/she be interacting with that urchin possibly? I have only had the urchin a few months. Also there is a wp-40 in that corner that is set to go off, and on every 15 seconds. Maybe the tang is there when it comes back on, and then freaks out? Or maybe a 6 inch long tang is too big for a 65 gallon tank?
 
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