Guys, I'm doing a bad job at holding back tears right now.
I was trying to take my betta fish out of his tank with a clear plastic cup, and I was going slow in keeping him in there and putting the cup against the tank so that I could scoop him out, but I guess I pinched his tail since he freaked out and squiggled, and I freaked out. I pinched off a tiny bit of his tail or something. It's like a small thin piece (like if you bite along the edge of your pinky's fingernail). I feel HORRIBLE.
He flared his gills, but it's weird. Like, he isn't flaring at me. Maybe he was mad at the cup? Or the cup AND me, but now he's okay with me? I don't know.
Is there anything I can do or should do in the future? He's swimming just fine, but I feel really bad.