A few months ago I opened my first reef aquarium and recently I noticed that the calcium content in the water had dropped to 350 ppm. I measured out the required amount of supplement according to the directions on the bottle and added it to the aquarium. Light. I did another calcium test a few minutes ago and it went from 350 to 440 which is what I wanted. Now that my calcium levels are where I need them, I can just use this product every week to keep my levels up. Highly recommended.
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