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it's very important to define what you mean by "supplement"
There are major and minor constituents of seawater that get depleted by corals and need to be supplemented and then there are other things (for lack of a better word!)
Calcifying organisms (ie: growing corals) deplete calcium, alkalinity and magnesium. These are major elements of saltwater and you MUST maintain their proper levels if you are to be successful with living corals.
<----For my reef aquarium I concern myself with levels of calcium, alkalinity, magnesium, phophates, nitrates.
"Vitamins" and such are a waste of money and you can spend hundreds of dollars on useless "snake oils".
A good rule is : if you don't test for it don't dose it.
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over 24 years experience with multiple types of marine aquarium systems
*see Upstate Reef Society Forum on RC and FB* GOOGLE JUNIOR'S REEF
Current Tank Info: 84x24x30 265g reef past TOTM honors
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