These little green bands have developed on the stalks of my neon green toadstool coral near the tips. Pictures below. Originally it did not have those green bands around the stalks. They appeared within the last day or two. The coral has been in the tank about a month. No other corals are showing signs of this. It did fall recently when it got knocked over by the snail so I had to re-glue it 2 days ago onto the rock. Any ideas what this is? Seems ominous...