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I noticed a small section of what looks like a purplish looking algae or slime on one of rocks corals. I know its not coraline. Do you guys know what that could be? Is it harmful? Where did it come from? TIA
It's a dead bleached coral. There's green algae growing on it but the purple looking thing looks like a slime of some sort. I'm charging my camera battery to take a pic and post it. My LFS said it could be because I might have traces of metals in my water. Just wanna make sure thru you folks before I buy anykind of water conditioner.