50/50. Sixlines can be douchy...can you maybe catch the sixline then introduce the sixline back? (Cut a top off a 20oz water bottle and invert it to make a funnel into the bottle and bait with his favorite food and set on sand). If not moving some rock around may help disrupt his "territory". Adding after the lights out or cutting the lights off for the rest of the night after you add the mystery wrasse may help some too it basically boils down to the Sixlines attitude i guess. Good luck