09-07-2011, 11:28 AM
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reddish orange tends to be iron related, reddish pink can be granite/feldspar, and i'm sure there are other possibilities too. the acid test to find organics in rocks i believe will also react with iron (if i remember my chem classes correctly). if any color comes off on your finger if you rub it, i wouldn't put it in a tank. unfortunately, a name like "moss rock" tells you nothing about the rock itself.
(sorry if my comments seem disjointed, i'm trying to sort through the geography knowledge i have, which is rather random since my parents both have educations relating to it but all of my knowledge comes from them)