Hi there, I've had my betta for a couple of months now, and she seemed to be thriving. Recently, I upgraded the tank from a 3 gallon to a 15 gallon, and moved her over. She seemed fine for several days, but lately has become very lethargic. About 3 days ago, I thought she might have passed away, as she was just laying at the bottom, but she seems to be moving about from time to time. I moved her back into her old tank, and she seems a bit more active today, but overall still quite lethargic. I believe her body color has changed a bit, lightened up. Here are some pictures, I know they' not the greatest but the curvature of the tank made them slightly distorted. Is there anything visibly wrong with her? Any suggestions? I tested the water of the new tank and old tank, and all of the parameters seemed fine. I took the water to petco and they tested it and confirmed the water parameters looked fine. Any help would be appreciated! If there is something I can do to fix her up, I'd love to do so.