A good rule of them for sexing by visual appearance is that females have more of a bar striped pattern. Males, especially mature specimens, will be almost completely spotted with no barring. The mouth structure is also different in shape but that’s usually prominent in mature Jags. Also, alike other aggressive cichlids, I would not recommend housing in large tanks with few tank mates. ( I believe there’s a such belief of too big of a tank or space for this fish). I would only seperate jags by themselves if you have a breeding pair. I’ve done this successfully multiple times with a single pair in a 90 gallon tank with multiple places for the female to hide. If not breeding, do not seperate them because they will become extremely aggressive in nature and kill anything that enters that tank. I always take the male out about 5-7 days after fry are free swimming, I never leave the male in until I move the fry out. I’ve housed jags, dovii and rays in one tank just to give you an idea, and once I seperate them for breeding, they would never tolerate anything else in their tank. Jags grow very quickly depending on feeding frequency, I would say they can reach max size from 2” in about 1.5 years if feeding once a day until it’s full.