My Betta is sick. After doing some research on the web, I thought it was fin rot because his fins looked ripped and there was a tiny black spot on his fin. I began treatment immediatly ( yesterday - put him in a small tank, tested the water ph, nitrate and everything first, then I added aquarium salt; I did everything I was told to do) but this morning I found him like this: grey line on his fin, dull colors and his face is white!!! He was not like this yesterday. What's happening to him?! What should I do!!??
PS. It is my first fish, so please understand I do not know much about diseases.