Calcium going up and down?

[Notsolostfish]

My calcium, with mag keeps going up and down with the apex trident. Why would my calcium keeps going uo and down? Isnt it supposed to go down only? My salinity is steady at 1.025. Its not evaporating. I have the tunze 3155. So whats the deal?

 

[TheBear78]

What's your Alkalinity doing?

 

[Notsolostfish]

What's your Alkalinity doing?

My alkalinity seems pretty stable when i test with hanna.

 

[TheBear78]

Do you test it often enough to directly compare with your Ca and Mg swings?