chances are, the live rocks is showing signs of decaying.. and it will spread to the rest of the rocks.. just a note, is your tank new? if so, that might explain why.. your tank is not capable to hold such high bio-load yet.. yes.. live rocks can contribute to the bio-load.. but it is very minute compare to the fishes or corals.. way to rescue the rocks is to find a mature tank and leave it inside first.. and wait till your tank mature first.. if not, very soon, u will get a rotten egg smell in the room..
Let us work together to preserve the world for our children to inherit by being responsible to our surroundings. Take nothing but pictures, leave nothing but footprints, bubbles and memories.
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