sandsifter
New Member
I have read these corals are sensitive to direct metal halide lighting. I have a 75 gal with two 175w 10K bulbs. Should I keep the coral on the bottom or move it up in more light? The reason I ask is because it is not recieving full direct light and it seems to be bleaching. I have also had trouble with calcium levels but lately my numbers are about: Alk 3.5meg/l, Cal 350 ppm. Just wondering if it is a light or a calcium issue. Thanks.