There are reasons (beyond geographical) why certain species are not found together.
In nature what ever cichlid dominates and fits into the trophic scheme of the ecosystem, and its habitat works.
In certain riverine habitats you will find a primary piscavorine predator, and omnivore and a vegetarian.
There is usually only enough space to support one of each.
Only in aquaiums do we find odd un-natural combinations,that will work temparily, until all hell breaks loose.
And most species are tailor made for their habitat.
In soft, low pH rivers of Colombia piscavore such as umbis and Cichla will be fouund,

In the hard high pH waters of Costa Rica dovii will be found, but the species above and below, will never be found together naturally.

Trying to combine such predators together, in opposite water parameters usually doen't bode well for one or the other..
In certain Panamanian rivers where I collect cichlids, one finds omnivores like Andinoacara

Vegetarians such as Isthmoheros

And Piscavorine gobies, such as Gobiomorus dormitor

and the populations of omnivores and vegetarians far exceed the populations of predatores, in balance with the available recourses.
In nature what ever cichlid dominates and fits into the trophic scheme of the ecosystem, and its habitat works.
In certain riverine habitats you will find a primary piscavorine predator, and omnivore and a vegetarian.
There is usually only enough space to support one of each.
Only in aquaiums do we find odd un-natural combinations,that will work temparily, until all hell breaks loose.
And most species are tailor made for their habitat.
In soft, low pH rivers of Colombia piscavore such as umbis and Cichla will be fouund,

In the hard high pH waters of Costa Rica dovii will be found, but the species above and below, will never be found together naturally.

Trying to combine such predators together, in opposite water parameters usually doen't bode well for one or the other..
In certain Panamanian rivers where I collect cichlids, one finds omnivores like Andinoacara

Vegetarians such as Isthmoheros

And Piscavorine gobies, such as Gobiomorus dormitor

and the populations of omnivores and vegetarians far exceed the populations of predatores, in balance with the available recourses.
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