11-30-2011, 08:53 PM
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There are three very similar looking species; two are in our profiles with photos [click the shaded names]: Hemigrammus bleheri [the Brilliant rummynose], Hemigrammus rhodostomus [the original rummy, now very rarely seen] and Petitella georgiae, the False Rummynose. The latter is quite distinctive from the first when you look carefully. In our profile of the first, there is a photo showing the differences between the three species.
However, if all fish came from the same group in the store tank, it is unlikely the species are mixed. In which case, the intensity of the red can pale due to stress. Water parameters, water conditions, bright light, or not sufficient numbers can all cause stress. This species is not very adaptable to conditions that don't suit it. The profiles mention the needs, so I won't repeat all that. But if you have any questions after reading the profiles, ask away.