07-19-2011, 08:00 PM
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Rasbora are generally the most tightly-grouped of the shoaling fish. I have found every species of rasbora--and I'm using this name in the generic sense, referring to those many species within different genera that are now moved into the subfamily Rasborinae--tend to remain in groups much more than other shoaling fish such as characins. However, fish will explore on their own, or in pairs, now and then. The main thing is they are together and know it, which gives them a sense of security rather than stress. It is difficult to say if they will tighten the shoal or not as they settle in to their new environment.
They are not active swimmers as for instance Danio or barbs are, so a well-planted aquarium suits them. The do swim though, they need their exercise too.
By the way, rasbora are not characins, they're Cyprinids [even though stores sometimes call them "Harlequin tetra"] so when I've posted I will move this thread to the Cyprinids section.