High calcium but stable alkalinity

[avgtigers]

My tank has been running high calcium 500+ but my alk is stable at 9.0 I have a couple of sps sticks and some lps and some softies. Ph is stable at 7.9. I dose sodium bicarbonate and am planning to switch when I run out of the sodium bicarbonate. I do 10% water changes every 3 weeks. Everything is healthy with only the occasion mort from a new purchase. What can be causing the high calcium reading. I checked with a Hanna and a salifert kit.

 

[Spare time]

What all do you dose?

 

[Randy Holmes-Farley Verified Community Expert]

500 ppm calcium is not a concern. Some salt mixes are that high.

900 ppm would be (and is very unlikely).

Try using a second syringe of titrant to get an actul value for calcium (by adding the two together) to get to the color change.

 

[avgtigers]

What all do you dose?

I only dose baking soda. I have a small bio load since the corals are still small and the calcium for the time being is replaced from water changes

 

[avgtigers]

500 ppm calcium is not a concern. Some salt mixes are that high.

900 ppm would be (and is very unlikely).

Try using a second syringe of titrant to get an actul value for calcium (by adding the two together) to get to the color change.

Thanks for the response. I use IO reef crystals. I didn’t realize that the calcium was that high over the 420 mark