I have had the same problem and in the end both my green bubble and my very large octi bubble died. The skeliton went from white to dark green as the flesh reseeded. I believed the problem to be an algae problem. I discussed this situation with many different people and they all thought it to be an algae problem. The strange thing is that neither coral showed the same signs at the same time, first it was one coral and then after it died it was the other. It also started at one end of the coral and worked its way to the other end, never showing on the entire coral at once. This all started after I bought the green bubble, so maybe it brought something to the tank.
Tom R
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