The Baseball Stars

The other day i got a dwarf gourami at the pet store. I made sure he was compatable with all my other fish before buying him and my tank in perfect condition (good water no filter problems etc etc) but he is acting VERY strangly. when i put him in the tank he immediatly hid. after a while he came out but for the past 3 days has swam with his face to the back wall of the tank in the same spot. he does move away from the spot but he rarely ever isnt facing the back wall and never strays far from it. I know he isnt sick or injured he is perfectly healthy. It just occured to me that the back of the tank is reflective.... could he be chasing his reflection? should i get another dwarf gourami? (or possibly a gourami of a similar size but dif. color? like red fire dwarf gouramis or power blue gouramis? would that be okay?) Any advice you can give is appreciated =D