I have a beautiful rock w/ zoos that were open when i purchased them but now only half are open. I check for nitrates, phosphates, and Ph, which are 10 - 15, 0, and 8.2 respectively. I have only softies and zoos in my tank. should i be checking for other things as well. could alkilinity or calcium be the source of this problem and should i generally be checking for them in my tank?