As the others stated Alkalinity is very important. The one thing that is the same when I loose a colony or piece is low alkalinity. I my self control it by testing it weekly trying to keep it in a range of 8-10 . If it is low I buff with Salifert Alk PH boost. I find If I don't keep my calcium above 400 and my Magnesium above 1400 the Sps start lacking in growth and some color. I learned alot of stuff off of the SPS forum on RC.
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