After a few weeks of a piece of driftwood being in my cycled tank, I had to remove it for a few days. I put it in a bucket with water (water that had been treated with dechlor) for a cup days. Then I removed it and let it dry out. That’s when I noticed a few tiny areas of flat, mint green color on the driftwood. They are completely flat and literally the color of green mint chip ice cream. Anyone know what this is or if it’s something to worry about? Sorry, can’t get a picture right now.