I just bought one of these from tropical island last week. he was out and swimming yesterday night when i put him in. my melanaurus chased him around a little bit but didn't really bother him, i have had him with a mystery wrasse before and he bullied him for a couple days and then left him alone and were perfectly fine.. i haven't see him all day today (which is normal i know) my concern was is this too sensitive of a fish to take on a little bullying. btw he was eating at the store and looked really healthy.