A few comments here...
It depends on whether you're talking about an initial group of small fish, later to be thinned out, or if you're talking about an eventual successful tank once they grow. It's not just water quality or gallons per fish, with these fish it's also about real estate, especially as they mature and start wanting to breed.
Guianacara and geos will compete for the same territory and eventually for some of the same breeding spots. So those numbers would work for young fish, but young fish only. As adults, just the 10 guianacara would be a lot for the tank. Six geos would be ok if you were talking about some of the smaller geo species, not really for the larger species.
Also, ime guinacara are pushy when they can get away with it. In other words you won't see it much with fish the guinacara respect, meaning some people may never see this, but with milder, smaller geos, like orange head (red head) tapajos, the guianacara feel they can push them around and so they will-- personal experience speaking here. In fact, guianacara, especially adult males, like to test other fish in the tank, even larger fish, to see who they can intimidate and push around. So, to make it work you'd either need to end up with a pair of each species and enough room for each to have their own space or a group or pair of geos either large or aggressive enough not to be bothered by the guianacara.
That's just the eartheaters, not counting the severums. Sevs do well with geos and/or guianacara ime, but as adults the numbers need to make sense for the tank.
It depends on whether you're talking about an initial group of small fish, later to be thinned out, or if you're talking about an eventual successful tank once they grow. It's not just water quality or gallons per fish, with these fish it's also about real estate, especially as they mature and start wanting to breed.
Guianacara and geos will compete for the same territory and eventually for some of the same breeding spots. So those numbers would work for young fish, but young fish only. As adults, just the 10 guianacara would be a lot for the tank. Six geos would be ok if you were talking about some of the smaller geo species, not really for the larger species.
Also, ime guinacara are pushy when they can get away with it. In other words you won't see it much with fish the guinacara respect, meaning some people may never see this, but with milder, smaller geos, like orange head (red head) tapajos, the guianacara feel they can push them around and so they will-- personal experience speaking here. In fact, guianacara, especially adult males, like to test other fish in the tank, even larger fish, to see who they can intimidate and push around. So, to make it work you'd either need to end up with a pair of each species and enough room for each to have their own space or a group or pair of geos either large or aggressive enough not to be bothered by the guianacara.
That's just the eartheaters, not counting the severums. Sevs do well with geos and/or guianacara ime, but as adults the numbers need to make sense for the tank.
