Thanks for the kind remarks, everyone!
I have a school of 2 dorados (Salminus brasiliensis) and 7 redtail brycon (Brycon sp., probably orbignyanus or rubricauda) in the 360. They range in size from 13 to 16 inches. The dorados are more streamlined, have a more muscular jaw, more lineated appearance on the sides, and are developing their adult yellowing of the fins. The brycons are fuller bodied, have a more silvery/plain appearance on the sides, and have redder fins. They are a bunch of bruisers. I can't feed my fish without getting splashed!