I have had my Betta for around six months now and he was shy at first but then he opened up. However for about a month now he has stopped eating as far as I can tell and he now has these black patched on his scales and inside his gills. I have included a picture.
I used to think that I knew how to take care of bettas, but now I'm not so sure. The guy at the pet store said to feed him every other day. some people say to do full water changes while others say to do 10%. I heard that salt baths might help, but I'm not real sure.
I'm lost and could really use some help.