CAN ANYONE TELL ME WHY MY ZOOS ALWAYS DIE OFF. I CAN'T EVEN KEEP YELLOW POLYPS. FLAME ANGEL, AND HIPPO TANG MIGHT BE DOING THE DAMAGE NOT SURE THO. ANY WAY TO TELL WITHOUT REMOVING THEM FROM THE TANK. LFS JUST TELL ME THEY REALLY DON'T KNOW. 150 GAL REEF WITH SOME TANGS. 2 400 WATT METAL HALIDES. ALL OTHER CORALS DO GREAT. MUSHROOMS, TORCH CORALS, LEATHERS ECT. THANKS IN ADVANCE.