I had a betta with popeye I used Maracyn and Maracyn 2 combo and it worked. One thing I suggest though is if you can get a hospital tank and quarantine that fish it would be better for your tank. I had a problem getting the tank water back to normal after treating the fish in its tank. I got an ammonia spike and had problems getting my nitrate level up after the treatment was done. My betta had some other problem too because about a week after treatment he stopped eating and had problems swimming I am not sure if it was swimbladder or the start of dropsy but he ended up dieing 
and I am not sure what the actual cause was all signs of popeye were gone. After a few water changes I got the parameters back to where they should be in his tank. QT might be your best way to go atleast this way you don't risk losing your biological filter load. The betta that died is the one in my avatar.
and I am not sure what the actual cause was all signs of popeye were gone. After a few water changes I got the parameters back to where they should be in his tank. QT might be your best way to go atleast this way you don't risk losing your biological filter load. The betta that died is the one in my avatar.
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. I really hope it was just a bite from the discus, coz he is a bit nippy, mainly at the clown loaches who gobble the food up right in front of his mouth, before he can get it. I got bored with my quarantine/ hospital tank so I bred some guppies in it, so I don't wanna medicate them. Other fish are not showing any symptoms... they are really happy
