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if your tank can support it you could even use KNO3. People use it a lot in planted tanks because the plants will use both potassium and nitrates. In a reef tank you might need a refugium to handle the excess nitrate but if you need a little potassium boost and have plenty of denitrification going on anyways, KNO3 is very cheap and easy to come by. Look for Grants Stump remover at Home Depot.
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