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Darn, I really like them because I think they look cool even when they get older. I've been keeping an eye out in liveaquaria's diver's den but I havent seen one there either... Hmmm
i don't recall a slender filefish, but mostly they offer the green filefish some call the "aptasia eating filefish" (acreichthys tomentosus). i also see what is called a "fan bellied file" - monacanthus chinensis
neither of which stop at 3".