A well fed fahaka will grow an inch a month until its around 12 inches then slow down a lot, but continue to grow over the years to potentially 18-20 inches. Mine hit a foot long in a year and is now around 15 inches at two years old.
If there is a significant size difference between the two fish it will massively increase the chances of a fatal fight.
If there is a significant size difference between the two fish it will massively increase the chances of a fatal fight.