Hello
My red devil Cichlid has red marks on his left side not properly operating his left fin. As a result he is laying on his side. It looks like infection but I have no idea.
Any advice please??!!!!!!
Thank you
How big is the tank? How old is the fish? What are the tank mates? When was the last water change? Did you add anything to the tank in the past two weeks?
Barring any better advice, I'd start with a water change. I'll tag @Colin_T since he's pretty good at diagnosis from a picture usually.