Calcium

[Markbluereef]

Hello,
56 gallon with dry rock and a few sps, lps frags, 2 clowns 2 blue cromis. Reef crystal salt. Salinity 1.025, ph 8.1, natrate 0.05, amonia 0, temp 78.

API calcium test says 500 is that possible? Seems high? Tank has been running 6 weeks did 20% water change last week.

 

[bonomo53]

API is not the most accurate test for alk cal and mag. I would test with a salifert or redsea. Also if it is that high it will not hurt anything.

 

[Geraud]

It is high but not crazy either. And indeed Salifert and Red Sea are more accurate than API.

 

[editour2]

I agree with the 2 comments above. Also worst case scenario that reading will not harm your coral, although a tad high.

 

[Caseyoidae]

Instant ocean salts tend to mix up very high in alk and calcium. Mix up a bucket and test it. You may be surprised lol I think bulk reef supply did this and the results are out there actually

 

[reefman]

alk n ca inversely affect each other.

http://reefkeeping.com/issues/2006-06/rhf/index.php