Calcium not increasing

[Zbass]

I’m have issues with my Ca not rising. It’s currently at 375. I keep easing my dosing amount and I’ll even does 12 ml at one time just to help and I can test it and 1 hour later and it might be at 390 to 400. I check again the next day and it will be back at 375. My Alk is currently at 10 consistently and my MAG is above 1500 which I’m working on getting it down. I have a 65 gallon tank and I dose 95 ml of kalk every hour and dosing Fritz Ca 32 ml a day.

 

[Gumbies R Us]

@Randy Holmes-Farley

 

[Randy Holmes-Farley]

How much is 32 mL Supposed to boost calcium?

How did you measure calcium?

Are you controlling salinity/evaporetion?

 

[Dakota_reef]

I’m have issues with my Ca not rising. It’s currently at 375. I keep easing my dosing amount and I’ll even does 12 ml at one time just to help and I can test it and 1 hour later and it might be at 390 to 400. I check again the next day and it will be back at 375. My Alk is currently at 10 consistently and my MAG is above 1500 which I’m working on getting it down. I have a 65 gallon tank and I dose 95 ml of kalk every hour and dosing Fritz Ca 32 ml a day.

I'm experiencing the same problem currently, but my Calcium is bottomed out. Eager to hear how this can be addressed.

 

[Randy Holmes-Farley]

I'm experiencing the same problem currently, but my Calcium is bottomed out. Eager to hear how this can be addressed.

There is never a situation in seawater where calcium is not easily raised with sufficient calcium chloride, which is used in nearly all calcium supplements. Your other post suggesting a value below 100 ppm with lots of calcium dosing sounds like test error if alk is in normal ranges.

 

[Dakota_reef]

There is never a situation in seawater where calcium is not easily raised with sufficient calcium chloride, which is used in nearly all calcium supplements. Your other post suggesting a value below 100 ppm with lots of calcium dosing sounds like test error if alk is in normal ranges.

I thought it could have been a test kit problem, but when I test freshly mixed saltwater, I get 380-400ppm at 1.024-1.026 SG. Last night my salinity was 1.027 again, but today it's back down to 1.025 so I think the corals are using it faster than I can dose it maybe? I'm just afraid to increase it TOO much at a time. I'm also trying to source another 50gal drum so I can do a 2/3 water change to try and reset.

 

[Dakota_reef]

I’m have issues with my Ca not rising. It’s currently at 375. I keep easing my dosing amount and I’ll even does 12 ml at one time just to help and I can test it and 1 hour later and it might be at 390 to 400. I check again the next day and it will be back at 375. My Alk is currently at 10 consistently and my MAG is above 1500 which I’m working on getting it down. I have a 65 gallon tank and I dose 95 ml of kalk every hour and dosing Fritz Ca 32 ml a day.

Have you checked a reef calculator to determine how many ml of Ca you need to raise your ppm by 20-30 in your tank volume? 12ml bringing it to 390-400 seems to imply that your corals are consuming 12-15 ml of suppliments a day.