08-12-2012, 07:00 PM
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I agree. Once they settle, they will all remain in a shoal.
BTW, these are distinct species, not sub-species. I know what you meant, you were thinking of the three species as all "rummys" which is fine, but not scientifically correct to call them subspecies.
I have a group of both Hemigrammus bleheri
and Petitella georgiae
in my 115g, and they remain together. I can easily see the individual species within the group, but to anyone who didn't know they would appear as one group of 23 of the same fish. I have never had the original species, H. rhodostomus, as its lack of intense red has made it much less popular now that the "Brilliant" species is prevalent. The false species, P. georgiae, is not common, I have only twice seen it locally, both times imported direct from Peru. While it lacks the intense red, it does have the wider-banded caudal fin which is impressive when the fish swim quickly down the tank in their formation.