water changes

[xtreme]

Originally Posted by fishguy007

what happens if i dont do them
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so is adding fresh water to the evaporated water not the same?\

You need to remove water and not just top up in order to get rid of some of the pollutants in the water. You replenish the elements that your corals are using when you add new salt water. The reason you may be having problems with your corals could be high nitrates, or maybe low calcium and kH?