I can't seem to keep my foxface alive, they last 4-5 months in my tank and die. I have other community tank fish, the regular chromes, cardinals, blue green chromes, tang as well as mixed corals. They seem to do fine, all tank parameters are in range (gravity 1024, Ph 8.2, ammonia 0, nittrate .2 . The only thing I do that I can think of that is killing them is that I have a raised rock bed which I turkey blast under it once a week as a cleaning routine. This is a 120 gal tank and I only do this to half the tank at a time. It does cloud the water for a time. Are foxface more susceptible to illness by doing this?