Since then, have cleaned out the tank by physically removing the foam via net, 30% water change and increasing the load of the skimmer. It looked like like a dirty foam that you sometime see when you are at the beach. I lost a barred rabbitfish, one spot rabbitfish, blonde naso, a pair of tomato and a mystery wrasse (that one hurt bad). As I said my large maroon gold pair were the only survivors.
Thanks for all your help and I will take a pic if it occurs again,
Jay