I have read a number of postings regarding the mystery wrasse and the potential to change from a good citizen to demon, terrorizing everything in site. My question is, does introducing this fish at or near last make a difference and what factor does aquarium size play in their incompatablity. I currently have a 650 gallon tank (108"x36"x36"). I keep (14) tangs, (3) swallowtail angels, assorted fairy wrasses (7 kinds), halichoeres wrasses (2), small tuskfish, red breasted wrasses, comet, pyramid butterfly and engineer gobies. The mystery wrasses would be an interesting and beautiful addition, but not if he's likely to wreak havoc on my current community.