Do you have a sump? If so, it could be poor surface skimming. Meaning a portion of the surface water is blocked off from getting pulled into the overflow. An oily residue on the surface is a sure sign of this. If your return pump sucked a little air in then foam could accumulate there as well. Usually changing the direction or adding additional surface flow/agitation will correct it. Pics of the foam and a top down shot (of your aquarium, not you) with all pumps running could be helpful.
Any chance your skimmer went nuts with micro bubbles?
BTW- When you get a chance fill out a reef showcase (Navbar-->Reef Tools -->Add/Edit Reef Info) that way we can see what all you have going with your tank without asking. Plus it's just cool...
Thanks for all of the good info. I checked and think it was a skimmer issue. I have a SeaClone 100 and really not sure when I have it set right. I understand most protein skimmers are difficult....for newbies!!
I'll be sure to get my tank info and photos up for future reference. Can't do it today though.
Sure is a good feeling to know you're out there! Thanks again.