I thought about doing that, but I decided that the coralline algae that the urchin doesn't eat will be a very nice touch of purples and reds and pinks and such. I do have a question on corals though. I would like to broaden my horizon on "black" corals. I'm looking for actual black corals like the Black Sun Coral at the beginning of this post and more. If not black, how about very deeply colored corals. There was a Galaxea coral that I had found once that was so deep colored it was almost black. In fact, I don't even know what the color was. It may have been a deep green but the contrasting white tips made it look definitely black. Does anyone know of any toadstools that are white? Or Black? I currently have this as easy to find definite corals.
Black Sun Coral
White Red Sea Pom Pom Xenia
White Bubble Coral