I think I read in some where for no3 to be remove they need to remove po4 together. Let say if your po4 is low then no3 is high when they want to remove no3 unable bec due to low po4. Both need to be high in order to be more effective remove both.
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Would prefer you get another stand and also salt water density and liverock we put in main tank will stress the glass. Sometime it better to be safe then sorry
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Heard reef octopus improved vision is coming soon. For china dc pump I prefer to get reef octopus as the after service is good also. The warrenty cover for RO for pump is 2 year and other part 1 year.
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