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By "hardness" do you mean carbonate alkalinity? If you are testing general hardness (GH) you need to switch to a KH test kit. Carbonate is constantly being depleted by hard coral growth (that's good) but needs to be constantly replenished. 15mL doesn't tell us anything since alkalinity supplements come in different concentrations.
What product are you dosing?
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Patience is a reefer's best tool.
Secret Xenia lover. M.S. Marine Biology
Staff - Marine Discovery Center, St. Petersburg FL
Tampa Bay Reef Club BOD 2018
Current Tank Info: 34g modded Solana
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