When young and stressed, they are often light brown, and especially without a substrate.
They can get large, at least 12" , and quickly to a point, but slow growth with age.
They can be very aggressive with each other, in any tanks under 100 gallons, but usually don't bother fish they can't swallow.
Starry Night is a generic term for any of the 5-10 Paratilapia species.
Color and aggressiveness will depend on which one.
below young P sp Andapa

again the same species, as an adult

Below a P sp small spot

below same small spot in a 6ft tank, click to run video