I have 4 clowns. 2 of which are large and 2 that are half as large. They have been together for 3 months or so. One of the smaller ones was driven away from the other 3. The 3 have bonded with a lage rock with a large amount of soft coral growth. Can't remember coral name but it grows like a weed. I have a 140 gallon tank. 3 tangs. A wrasse. A few shrimp and other inverts. Question is why did they drive him off. Will hedie? Looks really lonely. Other change was a few days before I pulled about 20 pounds of live rock that had rapidly growing sod corals out and set up a 30 gallon soft only tank. No fish. Any ideas advice would be appreciated.