Mixing Instant ocean reef crystals

Themastaa

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I mixed a batch of instant ocean reef crystals 8 gallons at 1.025 and I tested the water and the p.h is 8.0 calcium 460 alkalinity 7. I’m using ro water. Why is my alk a 7? Please help
 

Just grow it: Have you ever added CO2 to your reef tank?

  • I currently use a CO2 with my reef tank.

    Votes: 1 7.7%
  • I don’t currently use CO2 with my reef tank, but I have in the past.

    Votes: 0 0.0%
  • I have never used CO2 with my reef tank, but I plan to in the future.

    Votes: 1 7.7%
  • I have never used CO2 with my reef tank and have no plans to in the future.

    Votes: 9 69.2%
  • Other.

    Votes: 2 15.4%
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