LOL if talking purebred I would say a Trimac but flowerhorn wins hands down. My red devil at 16 inches didn't weigh as much as my flowerhorn at 10 inches. Flowerhorn are tall and wide and with a monster kok.ya, agreed, but thats a cheat lol
I would say a pearsei would probably weight the most.
Pearsi would be the heaviest
Dovii and jags don't weigh at 13inch especially Dovii. Amphs are mature at 13 inch. Dovii are still youngsters and thicken out laterid go with most amphilophus species or a big male parachromis dovii or jag.
they get a good size and get real fat.