04-02-2011, 11:50 AM
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This species, Pseudotropheus demasoni, is a rift lake cichlid endemic to Lake Malawi. Fish other than certain rift lake cichlids should not be housed with it, and this applies to all the rift lake fish. The only exceptions I have ever seen are some catfish species. But nothing else.
Being aggressive, this species should have a group of at least 12 fish to spread it out. Kept singly, it has probably heightened its aggression, taken out on the other fish obviously. Science now knows this to occur; "shoaling" fish, those that occur in large grops, often become even more aggressive when kept alone or in a couple fish.
Asixe from the above, the water parameters for rift lake fish basically exclude other fish. The hard and alkaline water needed for mbuna does not suit soft water fish like loaches.
As this is a specific fish, I will provide you with a link to some info from a trustworthy cichlid site: Pseudotropheus demasoni