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That's an oddly phrased question. Coral supplements can mean a very wide range of things, but assuming you mean things such as alkalinity, calcium, magnesium, etc., then yes, those are found in your salt mix. However, their values change depending on the salt brand. Also, their taken up by corals and may need to be replenished outside normal water changes through purchased supplements. The only way to know if this is needed is through testing your water, however, so it's near impossible to say if you need to purchase them without a good battery of water testing.
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