i think if they were both new to the tank, youd have a better chance..somtimes tangs that are already have est there boundrys will pick on another tang..it could take 4 days or, it will never stop chasing him,causing him to loose his fins,tail. stress out and die from all the chasing..i had this problem already.. i had a yellow tang already in my tank and tried adding a powder blue, it was died in about 10 days cause the yellow tang beat the hell out off him and stressed him out....powder browns and blues are the most commen types of tangs for easy ick.. i know from experiance
good luck mybe it will work for you
