Alkalinity dropping

[Klyph]

I’ve posted before about my alkalinity dropping significantly , presumably due to precipitation. I need to make sure I’ve calibrated my expectations. My question to you all is, how much should I expect my alkalinity to drop each day? 0.1? 0.5? 2.0...?

My specs
- New Red Sea Reefer 625 (150 gallons), cycled in early September
- 7 fish
- 40 small frags
- 1 inch sand
- roughly 100 pounds dry rock.
- refugium with ai prime fuge light (running)
- Protein Skimmer with CO2 recycling scrubber (currently off, as I try to control alkalinity)
- Carbon Reactor (currently off)
- Temp 79
- Salinity 1.026
- PH 7.9
- Mg 1400
- nitrate 6 to 8
- Phosphates 0.0
- Calcium 420
- Alkalinity- Drops down to 4.0 (roughly .5 to 1.0 per day) once I raise it to over 8.0.

My question is, is it normal for a tank with my specs to drop over a half a point a day?

 

[Jseimo]

Depending on the coral frags you have. Lps and sps can drink alk fast. Also coralline algae will consume it fast as well

 

[nereefpat]

- Alkalinity- Drops down to 4.0 (roughly .5 to 1.0 per day) once I raise it to over 8.0.

My question is, is it normal for a tank with my specs to drop over a half a point a day?

.5 to 1.0 per day is completely reasonable. If you are keeping corals, I would look into some way of dosing alkalinity, at least once a day.