Betta attacking reflection. What should i do?

I just got a new tank for my betta, and i didnt realize the walls would reflect. anyways, when i let him our of the bag, he started attacking the walls, and i was all like wtf??? but then i realized that he saw his reflection and thought it was another betta. I can tell he is pretty p*ss'd his gills are all puffed up.
What am i gonna do???
 
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