pull the fish and place into quarentine. If no qt, make a egg crate basket and some how suspend it over the lip of the tank. this will protect the fish from would be attackers. GL when they go down hill its hard to bring them back. My copperbanded and yellow tang are best buds (i got lucky).
cheers,
kurt
75gal 6x54w t5's on icecap slr's 3 blue +, 1 pro color, 1 ge 65k, 1 uvl spuer atintic, iwaki 40rlt return, mak 4 on closed loop to om super squirt, mak 3 on etss reef devil, jbj artica chiller, aquamedic calcium reactor, DIY Kalk reactor, DIY media reactor, currently running half phospahte/half carbon.
Live in Uvalde, Texas. On the fish hatchery!