I have a Half moon pale red and white betta fish. I bought him about a year and a half ago.
A couple of days ago, I noticed he was unable to swim to the top of his tank. He would try very hard, as he knew it was feeding time, but could only get about half way, and then he would sink, bottom end first. I assumed this to be Swim Bladder Disease, but was confused because I hadn't fed him in a few days, and everything I read said that SWD was from overfeeding. I did a full water change (I do this every week or so) and I didn't feed him for two days, and he has gotten worse. He lies on the bottom of the tank, almost not moving at all. I lowered the tank water in effort to help him get to the top to breathe, but he just lays there. I tried a pea, but he simply ignored it.
He is a pale almost see through white/red normally, so its difficult to tell if there are any color changes-it does look like he is swollen though
Water- Aged, conditioned and pH is altered to 7.3 because our tap water is slightly basic, 1/2 tsp aquarium salt every water change
Food- Either flakes or blood worms, doesnt eat pellets-every other day or so
Temp: Tank has a heater that keeps the tank at 76 degrees
What can I do? I saw another thread that had a similar problem, about floating the container in his tank to create humidity, and to put Epsom salt in with him? Can I use aquarium salt instead?