Yes I was confused with the other thread with about the same subject, but fish dying and coraline fading.

What are the odds? 2 threads with coraline fading...

Did i post twice? My bad....

there's actually 3 of them mods may have closed one

and more on topic check your ca and alk

Way weird. I just noticed that my green coralline is doing the same thing. I tossed in some "Purple Up" just now as a quick bandaid. Will test all parameters this aft.