I have a 90 gallon reef tank, as soon as my light go out my emerald constantly tries to get to my lavender mushroom (Rhodactis sp.) ( AKA, Purple Frilly Mushroom, Tonga Lavender Mushroom, Fiji Green Hairy Mushroom, Green Hairy Mushroom, Green Frilly Mushroom), as far as I know the emerald crab is herbivorous and is supposed to be reef safe. I am worried that the crab is trying to eat my lavender mushroom. Has anyone ever encountered this problem before?