All blue fish, with similar body shape? lol There are plenty of fish from Lake Malawi that are not blue, and do not have the same body shape, nor have the same body language, nor will they cross breed. One example, a group of C. moorii, and a group of L. caeruleus, which is a mix that I have in one of my tanks. In that same tank I also have a group of 8 S. lucipinnis, which although are synos from Lake Tanganyika, the synos that are endemic to Lake Malawi are near impossible to source in these parts, and IMO get too large for a 125, which is the size of my African set up. So clearly I am not picking on those that go non biotopish. I was simply pointing out some of the faults that I see with some of these set ups, that others feel are a success story.
Malawian cichlid originated from one lineage, Haplochromine. This is why they are so similar in body shape, color and can cross breed 100% in captive environment. Random sampling of aMalwian cichlid are are 90% blue, 10% yellow and red. Most blue fish have touch of yellow and red though, but are still predominantly blue fish. I have seen giant Malawian display tanks in pubic aquarium with 50+ species, and they all look the same blue fish with little contrast. The few Malawian tanks I’ve seen in YouTube that have rainbow color of red, yellow, white, black and blue fish are hybrid peacock tanks with names such as Strawberry, blood dragon and OB.
Lake Victorian cichlid have even less diversity, all haplochromine. Collectors have trouble isolating females of different species as they can’t tell females apart.
It’s Lake Tanganyikan cichlid that have diversity as the species originated from multiple lineage and inherited interesting variation of color, body shape, markings and breeding behavior.