Alkalinity Dropping Steadily Despite Dosing

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Randy Holmes-Farley

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Thank you for that. I’m just starting my refugium and thought it was solely for nitrate removal and biodiversity (pods).

FWIW, ammonia conversion to nitrate depletes alkalintiy, and nitrate consumption adds it back exactly.

Thus, if nitrate is rising, alk is being depleted, and if nitrate is falling (or being dosed), alk is being added.

Steady nitrate at any level has no impact on alkalinity.
 

Screwgunner

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Consumption of nitrate by algae adds alkalinity. :)
My phosphate is .005 nitrates undetectable ,do not have a low nitrate test kit . Hanna phosphate reads .00 twice it read .01 so it is close to .005 to .01 no coral just 13 fish. If my algae scubber puts alkalinity back in the tank why does it go down ,coraline algae? I am adding one half teaspoon reef builder everyday to keep it at 8 dkh. Please explain this to me.
 

Randy Holmes-Farley

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My phosphate is .005 nitrates undetectable ,do not have a low nitrate test kit . Hanna phosphate reads .00 twice it read .01 so it is close to .005 to .01 no coral just 13 fish. If my algae scubber puts alkalinity back in the tank why does it go down ,coraline algae? I am adding one half teaspoon reef builder everyday to keep it at 8 dkh. Please explain this to me.

Aside from hard corals, alk consumption comes from coralline algae, some soft corals, abiotic precipitation of calcium carbonate, and some calcifying inverts such as snails and urchins.
 
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