too much carbon?

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Don't think so. It can only pull out whatever is ther. But you can leave it in too long. After about 30 days it will start leaching the contaminates back into the water.
 
calcium, iodine, magenesum, things that corals use to grow, and stay healthy, if u do regular 10 percent water changes u should be fine, new water adds this back into the tank
 
I use one cup of carbon on my 55, keeps my water super clear. I do not really on it as a meas of filtration just to keep the water crystal clear (its really go at this).
 
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