My Betta. When I see him poo, ( Which seems to be never, lol ) it's like a orange string, which is the color of his Pellets, and the Pellet comes along with it. Now a days, I never see him poo anymore. He's not fat. I just don't see it, sometimes.
Over hundreds of bettas die in their small, dirty cups each day. Only you can help them live. Research and then save them, today!