I bought a rock with some mushroom coral, zoo's and yellow polyps, I'm not sure of the specifics of any of them. But I've had them for probably a month, and already 1 of the bigger mushrooms came off and floated away.It stretched its "stem" out during the night, until it was about 2 or 3 inches long and very thin, and then in the morning it was sitting in the opposite end of the tank, completely disconnected? I'm assuming this is a bad thing? Will the now unattached mushroom reattach to another rock and grow there? Are the zoo's and polyp's stinging the mushroom until it decides to leave? Here's a pic...