Okay, so I'm fairly new at the whole Betta fish thing, but I have had Mr. Sherman Whitmore for a few months now. I have never seen Sherman flare his gills, EVER, until last night when I put him in his new tank. I had a 1 gallon tank with a plant and a hammock in his old tank, and last night I put him in a 1.5 gallon tank with a filter, an LED light (on top of the tank), and a plant and a small Buddha. As I said, he has never flared at anything, including me or his reflection before, and I know he could be flaring at his reflection, or at me, or just because he intimidated or he feels threatened. I am just wondering if I might have made a mistake by putting him in a tank with a filter and ornaments, or if he just feels like he's happy and comfortable with his new home and feels like it okay to flare now that he's in his new apartment! I just don't know what to think at this point, and any help or advice would be greatly appreciated! Thanks!
Here's a pic of him flaring in his new tank (a little blurry).