?Saulos's Mbuna (Pseudotropheus saulosi):
Juveniles are all born bright yellow and the males transform to a blue with black barring as they approach sexual maturity.
or
?Elongate Mbuna (Pseudotropheus elongatus):
There are several types of P. elongatus. There is one variant which is extremely aggressive and should not be considered for normal compatibility and he has no bars across his forehead - solid colour. Any of the P. elongatus variants with stripes across the forehead may be considered OK.
(quote)
"I purchased this fish at the same time as a livingstoni, a yellow lab, a moori and a red fin. They all got along really well for the first 3 weeks (280 liter tank). Then the elongatus started digging tunnels big time! When he got the 5 caves the way he wanted them, he claimed them all as his territory. He has become an extremely aggressive fish. He is half the size of the Livingstoni and the Moori, but bullies them anyway. This fish is really nice looking, but due to the endless fin nipping, biting and fighting I'm going to try and sell it back to the pet shop."
Contributed by Brad Heppler