type of zoa

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What type of zoa is this on the right?
 

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Give them a moderate amount of light, stick it where theres a moderate amount of water movement and they'll pull everything else out of the water.
 
in your water, there are all sorts of essential elements like calcium and iodine. The corals need these to grow and will "pull" them out of the water as the need them. When you water change, you replace the elements that have been depleted.

Long story short, no need to dose anything was what I was getting at. :)
 
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