I am new to this and my tank has been up for about 4 months a friend gave me a green stripped mushroom and it settled in nice doing well until 4-5 days ago, something seems to be eating it. All thats left is the very center that is attached to the rock - any clues? My friend suggested I watch it during the nite to see if anything comes out and gets on it but I'm no night owl - thanks for any advice