I purchased some Blue Mushrooms about 2 weeks ago that were doing fine but recently started to look like they were dying. They have curled up and are no longer open. Are they going through a cycle or is this the beginning of their death? My water is good have checked all PH, nitrate, nitrite and amonia. Let me know if this could be a lighting problem. They are located in the middle of my tank and it is a 35 Gallon hex. Thanks!