Alk dropping but Ca staying steady?

[gurumasta]

My Alk drops consistently every day about .3 - .4 dkh

My Ca is holding steady around 430

Mag is 1460

What gives? I am using Red Sea Pro test kits / alk hanna checker (and red sea pro alk)

Last couple days I have dosed just alk to keep it in the rage of 8.5 - 8.9 but the Ca not moving concerns me.

Thanks!

 

[dz6t]

Calcium test kits are less sensitive than Alk testing kits.
1 dkh=17.8 ppm
0.4 dkH = 7.1 ppm
Calcium test kit may not be able to detect the small calcium level drop.

 

[dz6t]

To make it more precise,
Consumption of calcium vs Alk is : 6.4-7.1 ppm calcium per dKH
So for 0.4 dkH drop, you are expecting to see about 2.5 ppm of calcium drop.

 

[gurumasta]

Thanks for reply.

I am going to try just add the 2 part equally like I am suppose to instead of being a freak that likes to do things the wrong way...