we will be moving in a couple of months to a larger house. i have been considering taking the opportunity to remove 2 yellow tail damsels. we really like them but they occasionally get a little aggressive when they spawn(every couple of weeks). anyway i have also been considering adding a tang, as i will finally have room for a quarantine tank. i was thinking a kole, or maybe a purple if we get rid of the damsels(to still have the blue). so i am just looking for opinions on my bioload, and what to do with the damsels. they really don't cause much problem, but i don't want too much stress on the tang, or problems in the future. it's a mixed reef and contains 3 chromis, 1 filamented flasher wrasse, 1 black algae blennie, 1 red checkered sand hopper, 1 flame angel, 1 bangai cardinal, a pair of percs, and of coarse the damsels. oh, and it's a 120, 4'x2'x2'