Help! sick tank.

[danny zubot]

Last night I baffled my sump and did a 25% water change at the same time. Today my corals aren't opening up like they used to. My toadstool leather has no polyp extension and is drooping over, my purple and orange monti plate is turning yellowish, my sps had very little polyp extension and even my GSP is in hiding! My fish and inverts seem to be Ok accept for my female clown who has been suffering from a gill infection for a while now. The only thing I can think of that would cause this is that I didn't let the silicone cure long enough before using it. I used 100% pure silicon from Rona.

Should I expect some coral fatalies? What else can I do do help my tank? I do have a fairly fresh bag of carbon in the sump so I'm hoping that will help. Any advise?