I just checked my tank before going to bed and it looks like my skimmer decided to overflow and about a half cup of nastiness just went back into my tank. I shut off the return pump and only had enough water to do a 5% water change. I don't have any carbon on me but I will get some tomorrow and I will do a 20% water change. It looks like the fish and coral are doing fine for now. Is there any reason to panic or worry about serious side effects from the skimmer overflowing back into the sump? I also turned the return pump back on after the water change. Thanks guys.