Originally posted by Dr. Ron:
<strong>There are many different species of coralline in marine aquariums. Most, are under the sand bed. These occure at different levels and are most common in a DSB. There is many different colours of a DSB such as moroon, green,white, blue, pink, purple, red, grey, lavender,and in some cases, yellow(uncommon),black(very rare) and brown The black and yellow only grow under perfect water. Here are the levels that each occure at:
Top Sand: white/brown
middle-top:green
middle-purple,pink, red, lavender, and in some cases, yellow
middle/bottom-blue, sometimes green.
Bottom: moroon, grey, and very rare black.
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Dr.Ron knows his stuff here on all DSB's. Hope this helps!