My Xingus gave me an unexpected (and unwanted) present: the largest, which is much larger than the rest, swallowed the smallest one whole yesterday. I found him swimming around the tank with the tip of the little one's tail sticking out of his mouth, evidently uncomfortable, but keeping it down. By the time I got the camera, he was behind some driftwood, so no photos. The big guy is probably ~8" (estimate)...the small one closer to 5", and considerably thinner. I guess he's telling me to get to work on the tank upgrade! 