I have had my 40 Gal. tank going for about 2.5 weeks so far and today I noticed my live rock has white and red areas on it. Is this anything that I should be conerned about?
Well, first off, that's lava rock. I use it myself but a lot of people will tell you that it's not good for a reef tank. For a FOWLR I don't see anything wrong with it. But if you plan on keeping corals you may as well get it out now.