Brought home a new boy yesterday. I have a few concerns, after watching him...
His fins are very crumpled. I'm sure they'll unfold themselves now that he's in clean, warm water, though.
He is super lethargic. He just sits at the bottom of the tank.
He hardly comes up for air. I've seen him take a gulp of air maybe once or twice.
He likes to hide a lot. More than any other betta I've seen. He'll either sit in his corner or hide inside his tank decorations.
He's quite small and skinny but it's difficult getting him to eat because he's almost always hiding.
Here's a picture of him that I took last night: