I am still using the antibiotics, 100mg/40L.
I am starting to feel quite confident is his fins are no longer getting worse, the top fin has stayed exactly the same since losing that little nub. His bottom fin did lose the black bit overnight, but also the long jagged bit so I'm thinking either snagged or bitten off... either way... it makes the bottom fin look clean. I added salt to help it heal.
As for his eye, I just don't know what is happening there. I did his mythelene bath yesterday since his eye problem returned and it went half away right away. Then this morning it was bath. I've just done another mythelene blue bath and it is half gone again. I also did a 70% water change today.
I wouldn't say he was stressed before, but he has not been happy with me netting him lately. At the same time, he is swimming around with lots of energy a good 90% of the time his tank lights are on which is way more than he has since this problem started.
As for age, he is just over 1 1/2 years, so not that old.
His diet is mostly Hikari Bio Gold betta pellets which I pre-soak before feeding them to him. He sometimes gets a blood worm once a week.
I don't think he has any other signs of parasites. His poop is normal looking. I never see him actually pooping, he seems to do it at night as I often see it laying on the leaf of one of the anubias.
Water quality has been stable and I've not struggled with the stats at all, not even back last year sometime when I had to replace one of the sponges.
Sooooo... I think we are finally on top of the fin problem and I hope it won't resume disintegrating again... but I am at a loss about the eye.