Who Gives A Fish Forums

I've had these fish for less than a week, so I'm still getting to know their anatomy. There's this one thing that's caught my attention - a darker patch along the bottom of their bodies. It's possible they're just full from their last meal a few hours ago. I'm not sure, so I thought I'd check in and see if anyone else notices anything.

I recorded a quick video to help show what I'm talking about. It's only a minute long, but it's easier to get a good look when you can see them moving around.

I'd rather be safe than sorry and overthink it, only to find out everything is fine. Better that than wait and risk missing something. Fingers crossed it's just a case of full bellies.

Just full bellies, I'm guessing. Still, nice to double-check.