I have a 90 gallon reef tank that has been setup for 8 months. My levels are sg 1.026, temp 78-80, nitrates ammonia 0, cal 400, alk 3.0. I have t-5 lighting. Corals i have candy cane, frogspawn, bubble, 4 rics, zoos, gsp, lobo brain and my torch. I've had my torch for about 4 months now and i started out with 6 heads 3 have died and now there is another one starting to go. All the heads started out fine then one started dieing and i thought it was dieing because it was over shadowed a bit by the other heads but then when that one died another one started to close and that one eventually died and then another. I'm down to 3 heads 2 of them are doing really good and now i got another one started to close up its a chain reaction i can't figure out what is going out can someone please help me? I don't have any fish that bother my corals either.