hahaha not rare lah..... But i will treasure my hybrids alot(especially that lemon peel hybrid ).... anyway i heard dwarfy regular pecking will keep invisible flat worm population in check, so it may be good to have a few For me i have nv encounter a angel that wack coral so i till now consider all angels to be reef safe.. On the otherhand, I once had a PBT that nearly killed my squamosa so that gave me a very bad impression on tangs