I have a 150 gallon reef that I purchased and moved into my house about 2 1/2 months ago. This tank came with a Blue Hippo (about 5"), a yellow tang (4"), a black/white striped damsel, a percula clown and a blue eye tang (two spot) (about 4"-owner told me it was a mimic but after much research, I found the real identity). I would like to add a few more fish to my tank but have found that the two spot tang is very aggressive. Everyone in my tank gets along but I have no idea how long they have been together or what order they were introduced in. I added a Lawnmower Blenny last month and spent the entire month trying to protect him from the two-spot. I added a rubbermaid dish rack (looks like steps), then a bunch more junk to give him more room, then finally tore half of my tank apart to put up a net to cordon off 1/3 of my tank. The jerk tank always found a way to chase the blenny. He would bite him if he could reach him and harass him if he couldn't. Finally the blenny starved (he wouldn't eat anything I introduced to him and evidently he wasn't getting enough free grazing time). I tried for 4 hours to catch the stupid tang-hoping to QT him for awhile, then re-introduce him but couldn't without destroying my tank. How can I get any new fish when I never know what is going to be a problem? I don't want to buy new fish and have the two-spot kill them. He doesn't mess with anything else but he terrorized the blenny. The LFS has a Coral Beauty that I was thinking about getting but it is only about 2". Anyone have any ideas??