Very cool! Have you observed them feeding on fish scales in your tank? I bet that could be a nuisanceIn the guide book I'm using, Freshwater Fishes of Costa Rica Bussing states" The food (of Roeboides) consists of fish scales, including those of other characins, cichlids, and others, and aquatic insects. With its characteristic head downward position, using their external teeth it strikes other fish on the sides to dislodge and eat their scales".
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He calls them Glass Headstanders as a common name.
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Keep them well fed and you should be fine. From what I understand, they aren’t as bad as some astyanax species.Haven't seen it yet, they took to flakes even faster than the cichlids did. I drop them in the outflow of a pump stream, so they move fast with the current, so it seems to stimulate an immediate feeding response.