Newer low bio load tank and dropping alk..is there a common depletion rate based on load?

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joe-ejs

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Hello. I have a 90gl tank up and running for about 3 months. Very minimal load. Mostly coral frags and 4 fish. About a week or so ago my ALK measured around 6.6dkh and I bumped it up to 9.3dkh this past Saturday afternoon test. Today I tested ALK and it is back down around 7dkh in 4 days time. I am using Fritz 2 part and only dosing the Alk. Cal -450 and Mag -1380. Very little Coraline growth thus far.

Is this depletion rate normal? Is there something I am not addressing causing this? Salinity 1.026.

Any advice would be appreciated.
 
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austibella

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Hello. I have a 90gl tank up and running for about 3 months. Very minimal load. Mostly coral frags and 4 fish. About a week or so ago my ALK measured around 6.6dkh and I bumped it up to 9.3dkh this past Saturday afternoon test. Today I tested ALK and it is back down around 7dkh in 4 days time. I am using Fritz 2 part and only dosing the Alk. Cal -450 and Mag -1380. Very little Coraline growth thus far.

Is this depletion rate normal? Is there something I am not addressing causing this? Salinity 1.026.

Any advice would be appreciated.
Have you checked your calcium? I know you wrote 450 but is that what your tank is or what is on the box.. reason I ask is i use Fritz salt to.To much calcium will drive down your alkalinity as you get precipitation of calcium carbonate in the tank
 
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joe-ejs

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My calcium is measuring around 480 using Salifert test kit. Interesting thing is I have yet to dose Calcium as it has not dropped yet. I dose the Alk once per week currently.
 
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