Originally Posted by Colibri
I've seen almost all my fish poop. They're definitely not shy about it. I noticed something really funny about one of my boys. If he hasn't pooped, all I have to do is show him his reflection and then, suddenly, he'll do it! Just like that! While he's flaring and showing himself he'll start to poop! I guess he thinks the opponent will find it disgusting and will go away, hahaha!
Omg, my fish did this the other day too! I accidentally fed him to much, so I pulled out a mirror thinking the exercise would keep him from getting bloated/constipated. And lo and behold, he IMMEDIATELY started pooing! Hehe, this is a great trick to prevent your betta's bowels from getting clogged up!