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I thnk my Calcium level is a little low what is the best way to bring this level up and maintain it.
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You can use a 2 part cal/alk or drip Kalk and add a calcium supplement when necessary. In a tank your size if you plan to add stony corals it'll probably be cheaper long term to add a Calcium Reactor.
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how long do you run your lights a day?
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I'm running actinics for about 12 hours and MH for about 5 but anything within 8-12 hours should be fine.