I have had my betta fish since febuary when I first got him he was lively and swam around the tank and would even flare up sometimes. After 3 months I noticed his color was beginning to fade and his fins were not as big and vibrant. I changed the water and decided to see if he improved any. Over the next couple days he seemed to improve. Recently the other morning I woke up and looked at him and he doesn't have much of his fins left. I also noticed a behavior change in him. He eats fine, but he doesn't swim around as much as he used to. Sometimes I will come home from work and I will find him staying in the bottom corner of the tank or the top corner of the tank. Usually once he sees me he will swim around some more. But anyways I am pretty sure he has fin rot. And I bought some jungle aquarium salt and some stress coat fish and water conditioner to try. What I am wondering is how much to put in my water.
My tank is 6.3 liters. The bottle of stress coat is dosed for 2 tsp for 10 gallons of water and the salt is dosed for 1 tablespoon for each 5 gallons of water.