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- More than 10 years
The whole poop is dark?They are dark
Even though I can't be certain and I usually don't like blindly recommending treatment, I'm thinking I may go ahead and suggest treating for internal parasites. If he does indeed have parasites and those are eggs you're seeing and describing, we want to cut off the lifecycle of the parasite before the eggs hatch and cause any more problems.
However, first, I'd like you to try Epsom salt baths. This may help him push out whatever it is inside him, if he can. Get a clean container or spare tank and fill it with tank water. Dissolve a tablespoon of the epsom salt in the water, then put your betta in for no more than 15 minutes, then return him to his tank. I'm hoping the muscle relaxant/laxative/swelling-reduction properties of Epsom salt will help him pass whatever seems to be dangling from within him.
If not, while trying to research this and pinpoint what it may be, I came across this Treating Hexamita aka Spironucleus. I don't know if your fish has whatever this thread treats, but it got me thinking about soaking your betta pellets in epsom salt so that he can get it inside of him as well. I'm more comfortable with this option than trying potentially harmful or negative medications without being certain what's going on, plus it should help him even if it is just really bad constipation.
You haven't seen him poop normal poop at all, right? Or found evidence of it in the tank?