Had a quick question. Picked up a Rostratus to fill a void in a shipment of fish a while ago. "he" (hopefully) is 4 1/2" or so. Looks like a typical juvie fossie, but just beginning to pick up some light copper color on his lips, and a copper sheen in his dorsal fin. Also when he is "displaying" with another fish, it gets a black stripe the length of his dorsal and black in his anal fin. The body will also get a bit darker. Not sure if this its typical fossie stuff, but being the only rostratus in the tank, I wondered if this meant "male"?