LockeOak
New member
Much of the LR I put in my 10G nano had quite a bit of purple coralline on it, also some green coralline. Under my cycling light setup (13W PC and a 60W incandescent) it did fine, under the permanent setup (130W 50/50 10K/actinic PC) it's dying off. I can confirm that it is the high light levels and not low alkalinity or Ca (alk is decent at 7.5kH and calc is unknown), as a long piece of horizontal tonga rock was half shaded by a big ball of chaeto. After about 3 weeks, the purple coralline on all the rocks as well as on my turbos' shells is turning gray and dying off, after moving the chaeto to the fuge the once-shaded coralline is beginning to die as well. It's not really a problem, I'd rather it die off than cover my glass, but I'm glad that I figured it out and it's not a water problem. The green coralline is doing ok, which is fine by me because it's a really cool color (almost fluorescent!) and doesn't seem to grow in plates. Just an observation to help anyone else wondering why their LR is now covered in gray spots.