Got these black spots showing up on my betta fish. he had one on his head, I went ahead and threw some aquarium salt in there and waited, it seemed to go away. Then I noticed these. You can see them on the other side of his body, but I thought I would just show this side. It also looks like a black line is forming on his underside where the beginning of the bottom fin is. You can see it there.
I did a water change today after having salt in there for a week. Then I tested the parameters (listed below). I changed the filter cartridge, it was time to do it.
P.S. - He isn't acting lethargic or not eating.
Does anyone have an idea of what is going on?
pH - between 7.2 to 7.6
Nitrates - 0
Hardness - not sure
Nitrite - -0
Ammonia - 0
KH/Buffer
Water Temperature usually 78-80
The second picture is what he looked like when I first got him. Just wanted to show his head.