I do have a reef tank. Honest to God, I just did a pwc
tonight and vacuumed my CC bed. I did this after lights out and I am assuming that stirring the CC mixed the pink CC with the white CC beneath it. I will look tomorrow when the lights come back on. If it is mixed up I will post a picture before I do my next pwc
in 1-month, I'm assuming it will have grown back by then. I am not claiming it to be thick coralline like you see on some LR
. Im just saying that my white CC has turned pinkish and purplish and my guess would be coralline.
As for now, I went through my old pictures and found this one of my dying Acan (tissue damage from falling) which was on the substrate so you can kind of see what I am talking about. But this picture does not really do what I am talking about any justice.
I also included a picture of my substrate from months ago so you can kind of see the difference. By the way, that is a crocea clam on the bottom of my tank without halides. You may not believe that I was able to keep that clam healthy for around 7-months to date, either.
I never claimed to have poor water quality.