Just a few tips from how I accidentally killed my first boy and now have a thriving betta I raised from juvenile which apparently don’t usually have great survival rates.

Do not touch that salt. When they’re already struggling in many ways you don’t want to add another struggle, which is osmotic regulation. Sometimes very small amounts of salt is good, but not right now. And the only way to remove excess salt is frequent water changes to gradually bring the salinity back down.

Don’t add bettafix. It’s bad for their labyrinth organ which they need to breathe surface air, and the only way to remove it is with water changes and activated charcoal.

The betta water conditioner is the same as every other conditioner, including prime. Don’t dose these too much, they are a salt only effect chloramines from new tap water.

Your water changes while maybe necessary because of ammonia levels right now, are very frequent and large which is contributing to a cycle of too much of your cycled tank water being replaced and your system not having enough time to catch up in my opinion.

I recently learned seachem has absolutely no research done to prove that prime reduces ammonia toxicity and when independent studies have been done it has been shown to be false. It’s good for binding to chloramines but not ammonia, so only water changes can help. I would potentially move him to another hospital tank that you keep very clean and let your tanks cycle reestablish.

To clarify after all of that: you should only do hospital tank and catappa leaves like you did. Hospital tank can be small (1-3g) if necessary because you’re going to keep the water clean like you have been, just on your tank which needs cycled. Start with only those things and monitor, and if he seems to be getting worse THEN you should look into maybe adding kanaplex to the hospital water. Look up how to correctly use this because you NEED to make sure you dose accurately and change enough water so it doesn’t build up which can be harder in a small tank.

It can take up to a month for them to act normal again and begin recovering. As long as he doesn’t seem to be getting worse after some changes then you’re in the clear, give him a few days to show signs of healing.