What is on my Toadstool Leather Coral?

[NoLobster]

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...

 

[MixedFruitBasket]

Considering the location and the consistency I think that it's more than likely a normal color change/development/maybe even shedding. I wouldn't worry about it. Pigment changes can be pretty normal with corals in a tank.

 

[NoLobster]

It went away after it sucked in its polyps for the night

 

[Crabs McJones]

Looks like it had a layer of algae on it, and when the polyps extended it took some of the algae with it causing the rings. Once they retract it should go away