DPS do you ever check your nitrates? Don't be offended, please. Reason I ask is I had a case of ick that came in with a coral beauty a while back, next thing you know everyone had it. I was going to try a hypo treatment, and set up a QT, all the usual. I decided to test my nitrates, and they were way out. I hadn't tested them in probably four months, because the corals were growing like crazy, and I was doing real frequent water changes. I read the test, and had to do it again because I couldn't believe how high they were. Long story short, after what had to be around a 70% water change, and a vacuum of the bottom of my tank, 'trates went down, ick went bye-bye. Probably not your problem, just thought I'd share. Good luck!
Joe