Very sick convict cichlid
In order to get advice, you need to tell all the details. How big is your tank, how long has it been set up, what other fish you have, what is your water change schedule, what are your ammonia, nitrite and nitrate levels, what you feed your fish, etc. I don't know anything about convicts, but getting these answers will help whoever does, and sees this next, to be able to help you better.
20 gallon high-tech planted