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Hybrids
A lot of the Mbuna sold in aquarium shops are hybrids. These should be avoided like the plague! Hybrids are unpredictable in terms of size, behaviour and colour. If paying a bit more means that you can get a true species or geographical variant, then that’s the way to go.
Conversely, don’t dump hybrids on retailers. It ruins the hobby for everyone if people think they’re getting one particular species but end up with some kind of hybrid. Unless you can house your hybrid offspring, painlessly destroy them.