Toadstool Leather Coral

[The Grizz]

Most leather type coral actually go though a molting phase where they will appear to be gray & slimmy. They will produce a mucus film on them & if not moved in to more direct flow for a temp period they can stay like this for some time, it's a normal phase they go through as they grow. If you can't or don't want to move it put a small power head directed at it until you notice that it is returning to normal.