This product is designed to increase potassium in your SPS or low nutrient reef aquarium.
Some reef aquariums will need supplementation of potassium for montipora and other SPS to thrive.
Potassium may also be depleted by bacteria.
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I have a fully automated 9ft reef aquarium. Majestic have always been good to me. They have the biggest range, they match all prices and give the best advice. - Anthony Care