The first injuries were to pectoral fin, anal fin, and tail fin, causing them to turn red. The injured pectoral fin was shredded and the sen could barely use it. The only inhabitants are the 6" delhezi, 5" lap, 4" more, and 16" SAL. The injuries happened about 2-3 weeks after the introduction of the del and lap, whereas the sen has been in with the SAL for 8 months or so. The lap also took over it's spot on top of the sponge filter around the time the first injuries occurred. After the injuries had healed, I've saw the sen square off with the lap as the lap ate, like it was trying to pick a fight.