My niece was visiting while I was at work yesterday, and she sneaked into my room without my mom or sister's knowledge and fed my betta.

By the time I discovered what happened this morning, the water was a brownish green color (I don't know if it's from the excessive food, the fish's bowel movements, or both) and Lala was still eating. I've heard that goldfish will not stop eating. Are bettas the same way? I've completely changed his water, and I haven't fed him anything else. I'm trying to keep an eye on him, but I don't know what to look for or what to do if I do see any signs of poor health. He does not appear lethargic. When will it be safe to feed him again? What else should I do for him? Thanks for any suggestions!