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Spotted these guys without a tag at my local Petco. After waiting 10 minutes for the sales clerk to try to identify them, she finally called them Otocinclus Catfish. I don't think so...
i've seem them at my petco store. they labeled them as rainbow gobies. they also had a variant called neon rainbow gobies and they look similar, it's just that they have a reflecting bluish-green stripe along the side of their bodies.
that's all i know about them frankly. i've seem them bunched up so maybe they shoal but don't quote me on that.