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We are new to this hobbie and we just purchase our first fish and coral! We have this orange brown stuff growning all over our rocks. All of our levels look good-and we have done a water change thinking it would help!?! What is it and how do we get rid of it? Please Help!

We have just estabilished a reef tank-its only 4 days old! we just added 26lbs. of live fugi rock. We are trying to test the ammonia and we followed the directions that came with our lab kit (Red sea marine lab) and it gives us a green color-that is not even on the card to be matched with! we...