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That's exactly what it looks like. Thanks for the quick replies! Glad to know it's not something crazy!

I have had my 55G tank with live rock for a couple of months now, and in the past week or two, it has become covered with a deep orange-brown (Color of rust) residue, specifically on the top surfaces of the rock. Some is also forming on the sand bed and walls of the aquarium. What in the heck is...