My betta has this grayish silver stuff on his fin. He’s in a ten gallon tank that is split into two.. so he has 5 gallons. There is not a fish on the other side of the tank. He has been suffering also from fin rot. I just recently put him in this tank since he was in a 2.5 gallon bowl. He has a heater set at 80 and a sponge filter. The tank has been cycled. Right now I am medicating the ten gallon tank with Maracyn two. I’m on day 3 out of five. He also has Popeye.
Any advise? The Grey/white stuff is getting close to his body. Is it a fungus or bacteria??