I have a few of these in a tank. Really nice fish, although they dont tend to grow much more than 6" as far as I know.
Also I think they are known as talapia Mariae aswell??
Mine are aggressive, had 6 to start with, now have 5 and 2 have laid eggs already but been eaten. I suggest taking it and finding a female as this must be a male at this size.
Great active fish, nice colours when settled in tank, although mine are green bodied not red like on in the thread pictured.