I have been doing a fishless cycle for about 1.5 weeks now and I have noticed that my aragonite is turning a brownish to orange color and there are little pockets of color in the aragonite that you can see through the glass that are under the surface of it. The aragonite is about 2.5" deep. Is this just some algae and should I just leave my lights off for a couple days. If it is algae then why would it be under the surface of the aragonite. SG is 1.009 Temp. 77-78. I tested my water yesterday and Ammonia was 0 so I added some more to get it to 2-3ppm, nitrites were off the chart and nitrates were 60, P.H. 8. Thanks!