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Broomer5, I am using reg tap water. It sounds like I am best to use some other type of water. Perhaps distilled water?

Yes this is dead coral. I do have live stock in the tank and they are all doing well. Regarding the water it was tap water. :santa: Do you know how long it takes to dissapear and is there any chemical I can use to help it go away?

Hi, I am new at this and had a tank for 1 month. I have 4 really nice pieces of coral. They are starting to grow brown spots and are looking ugly. Is this a good thing or bad thing? It sure looks ugly. What is happening to my tank? What causes this? Also my glass is growing this stuff.