11-19-2006, 10:37 PM
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Actually, if it were cyano it would be more burgandy in color. What it sounds like is Coraline Algae growth, which is normal and not harmful to anything.
If in need of critters to help keep the sand bed clean, maybe try nassarius snails? These do an awesome job and are pretty easy to keep. They spend most of their time buried in the sand, and they eat a lot of detritus... comparable to the sand stars if not better. When they come up and go down into the sand, they're a blast to watch. You'll just want to be careful not to let them crawl on your skin, as whatever is in their slime will numb your hand, fingers, or whatever else they climb on. I found this out the hard way and it was a pretty disturbing feeling, even if it was harmless.