i have heard of SOME blue tangs eating zoa's from quite a few people... never seen it first hand, but from what i understand they can definatly get a taste for them... GL with whatever you choose, but most likely, i would think, the blue or the zoa's would need to go... unless you make some sort of "cage" for your zoa's or relocate them to the fuge or something (should you happen to have one) GL!