Can anyone help ID what this pest is? sponge? worm? parasite? other? I've found this growth on just this one sps piece. It has not spread to any others. I've dipped it a couple times in Revive, but it eventually comes back. It doesn't appear to kill the sps, but just grows on it. I've tried pulling it off with tweezers, but it just sort of disintegrates. The sps continues to grow and isn't too bothered by it, although the sps doesn't color up very good.
