In November 2006 I got 6 Oreochromis at 7-8cm and already in December 2006 I got 90 fry from one of the females.
I keep them with my Petrochromis and it seems to take some of the aggression in the tank, and until December 2007 I have no problems with them 3.3, but then the biggest male killed one of the other males and start hunting the other, and now they are going in 2 tanks.
About the colour my dominant male are colourfully all the time and he have very red tail and fins, but the other male looks still like a female. The rest of my fry (I have 20 back) have no colour, but one of the fry who goes with his parent shows colour.
When I visit the lake in September 2007 I saw Oreochromis with a lot of red in Kalambo, but I saw pictures from Mahale where the males have no red colour.
I think that the Oreochromis is a very interesting cichlid and I'm looking forward to keep them the next years.
At last a very nice thread about the Oreochromis with some wonderfully pictures. http://www.petrochromis.com/t_forum/topic.asp?TOPIC_ID=247