Thanks. They can get aggressive with eachother, mostly chasing for a few seconds at a time. I removed three of my sub-dominant male saulosi last week that just couldn't hang. nipped up fins, battle scars, and a messed up pectoral was enough to take them in to my LFS to find a new home.
The bumblebee will most likely be re-homed when he reaches full size. I'm thinking of adding an Acei and a few Afra variations, possibly removing one of the breeding female saulosi.