haha, unfortunately I have not kept either b4, but my mystery wrasse, which was once kept at fren's place goes for the kill for all other fishes, as for naoko, heard alot of stories bout it attacking bigger fish.
Oh my... IME, the one that I had in the past was rather ok with other fishes. Then again, things may change. However, I still don't understand why the 6-line appears so fearsome to other fishes much bigger than itself.
6 lines are from the genus pseudocheilinus, which are the lined wrasses. all wrasses from this genus are very aggressive and don't mind going after fishes bigger than them. mystery wrasses are from this genus too.