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We don't have rasboras but the harlequins are beautiful. We have zebras which my daughter calls "ding dongs." They DO NOT STOP MOVING! They are very, very active to the point where I have read they can aggravate other fish like gourami. Our gourami don't seem to mind thus far but we have a very busy tank. Not sure how their bioload would compare to rasboras. My guess would be they'd be slightly higher... ???