06-20-2007, 08:48 AM
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are they the rocks that are supposed to look just like live rock with the pinks, purples and greens in it? if so, i have seen them in a lfs around here. they looked neat at first. but then the next time i went there they were covered in algea. i have no experience with them to tell you in they are going to algea on them or not. they might, just like synthetic corals do. but if you do use them just be aware that there is a possibility that algea can grow on them.