My very first African (along with an electric blue hap) is understandably my beloved fish. When I bought it little did I know about aggression but it taught me the basics in no time at all. I initially acquired a couple (or so it seemed) but it turned out to be two males. After a couple of weeks one of them was dead. I then bought two more females and now life is much easier. In contrast to most mbuna, the male is the yellow fish and the female is the blue one (with dark blue vertical bands). The fish is very aggressive (even by mbuna standards) - even the females are intolerant of each other. It is better to have a tank dedicated to mbuna and house more than a couple of aggressive species in there (other Pseudotropheus like zebras or Melanochromis species). This is the only way to have some milder species in the same tank. It will defend its spawning site ferociously and will even attack your hand or the glass scrapping magnet when it comes close to its territory.
With the right kind of food it acquires a very bright yellow color, equivalent to the labidos. Grows to 12 cm or more and occasionally feeds on algae. It will eat as much as offered and lose the right shape becoming more "rounded". Do not overfeed. Among all the mbuna species I keep it is the most sensitive to the presence of carbon dioxide in the water. As with all Africans it is an extremely intelligent fish. Despite its aggression it is a playful little guy. Whenever I put my hands in the water, it will immediately attack me as an invitation for play ! I try to catch its tail and it tries to avoid it. Every time I catch its tail, it will just move away as if insulted. Once we start playing it simply tried to avoid the fingers without any biting.
Minimum tank size : 150 cm / 500 liters, no second male will survive in anything smaller than 200 cm / 700 liters.
Another nice article about M. lombardoi, by Matthew Childers can be found at http://www.aquatic-hobbyist.com/phpBB2/viewtopic.php?t=1178
See next page for photos of male and female Pseudotropheus lombardoi