I don't mean to derail the thread here, but I have a minor question on the same topic. What is a "normal" color for betta feces?
I ask this because my betta had a small string hanging out yesterday with feces attached. I did see him eat a very small piece of string that came off of a decoration the previous day right after I spotted it and before I could remove it from the water. I'm pretty sure that's what it was, as he is very active, colorful and curious. I'd just like to know what to look out for.