A little over two weeks ago I placed a new green toadstool In my mixed reef tank. It didn't open for a couple of days then opened and looked great. This lasted about five days.Then my new green closed up & seemed to shrink .Then my brown closed andwill not open.The brown now looks shiny & still won't open. I have done water changes even though water quality seems alright.I'm worried !!! New test kit on the way.CAN anyone help me out?? I would hate to lose the brown had it over a year an is as big as a dinner plate.