Hello 3reef, Lately I have been noticing a grey feathery algae growing on certain pieces of live rock. Its not dense like green hair algae, its more random and lightly sprinkled over some of my rocks. I've been looking through common algae pics and have not been able to identify it. Other thank it being grey, short, and growing lightly on my rocks I really can't explain much more about it. Anyone know what I'm talking about? Any help is greatly appreciated. Thanks. Sorry, as of now, I have no pics. I'll get some up tonight. In the meantime, deal with it Police!