jlanger
@thatfishcookieguy
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Just curious...what are your settings for the two dosing pumps? I have that large Idaho Grape colony and it looks mostly brown in my tank. I've been trying different things with the Apex to dose my calcium and alk at different times. Just wondering what you are doing. I set my minimum PH to 8.35 and max to 8.45 yesterday. Is that high enough?
I have been keeping my alkalinity at 8.2dKH and my calcium at about 450ppm.
My pH stays around 8 to 8.2; mostly 8.0.
The color issue is more in part due to the lighting change.
What lighting are you using? LEDs, T5s or halides?
That piece was lower in my system and was being somewhat shaded; hence the whiter edges. The Idaho Grape will turn brown when it is not getting enough light. Slowly raising it higher or to a place with more light will bring back that purple color. In that last photo above (with the large montipora colony) you can see the parent Idaho Grape colony in the left corner (dark purple); but the Idaho Grape colony on the upper shelf has a much lighter color (lavender) due to being higher up.
Give the frag some time and it will rebound.





