any coris wrasse will be a good canidate but the yellow coris wrasses seem to be very hardy . there is an australian rainbow coris wrasse that is tough as nails and would work great . i have one and he is a very good tank mate and very hardy too .i would stay away from flashers and fairys as they wont do much "work" for you in this situation . leopard wrasses will eat them but they are tough in the begining because they need pods which you have and that may work but they acclimate poorly . i hope that gives you some direction and there is certainly a wrasse for that job ,,i would go for a coris wrasse myself. keep us posted please and good luck .