I had a similar thing happen long ago when a clamp failed over the sump and dropped one of those cheap fluorescent tube hoods into the sump. I didn't have nearly that dramatic a color change, but I did get some decent red tinting to the water. There were fish and cleaning crew alive in the tank when I discovered the accident (only about an hour after it happened [at a maximum]), but even with a good sized water change, enhanced skimming, and carbon, everything died within a day. I hope that your tank doesn't suffer any negative effects, but I would test for everything you can, add fresh carbon, and do a major water change at the very least.