A gourami attacking his reflection

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I have a lovely little blue dwarf gourami who chases his reflection up and down the right side wall of the tank. I assume he sees his reflection as an enemy male. I have attempted to put a background/blackout that side, but the reflection of the sun (through a window on the other side of the room) had rendered my efforts useless.

In lieu of moving the tank, are there any ways of halting this behavior? I am fearful that he is causing himself undue stress.

He has been doing this for about 3 days, is it likely he will ever stop?

Regards!

 

[Jason7894561230]

He will stop he will get bored or forget or something either way it doesnt matter he cant hurt himself and he is taking his aggresion out on a reflection instead of the other fish. Feed him then he will for get or something but he wont continue