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Snapped this shot of one of my baby (but rapidly growing) Armored Bichirs - Polypterus delhezi. If you look closely you can see the external gills quite distinctly.
Don't let the picture fool you. It is still a baby and would have a hard time measuring four inches even if it stretched!! Still...this one and its brother/sister (they're tough to distinguish at this age) are growing very nicely and will be ready for a bigger tank in a few months.