Kh eternally stuck at 7

Randy Holmes-Farley · Mar 23, 2017

Assuming an actual drop in alkalinity by 3 dKH, calcium would only have dropped by about 20 ppm, so you probably just don't accurately detect the calcium drop. Most test kits cannot reproducibly give better results than that.

Surfandturf · Mar 23, 2017

Randy Holmes-Farley said:
Assuming an actual drop in alkalinity by 3 dKH, calcium would only have dropped by about 20 ppm, so you probably just don't accurately detect the calcium drop. Most test kits cannot reproducibly give better results than that.

Ok that is good to know. So what do you think could cause such a dip in kh? CO2 ?

izzyishh · Mar 28, 2017

@Randy Holmes-Farley i have also been curious about Cal &Kh my KH is always at 7 or 7.5 and Cal is at 460-480 is that ok I run LPS 29g dominated by acans

izzyishh · Mar 28, 2017

I also do 2 part I may have to stop the Cal and just add Alk for a few days or weeks.

Randy Holmes-Farley · Mar 28, 2017

Surfandturf said:
Ok that is good to know. So what do you think could cause such a dip in kh? CO2 ?

CO2 added or subtracted from the water has no impact on the alkalinity. How much alkalinity (in dKH per day) are you currently dosing?

Randy Holmes-Farley · Mar 28, 2017

izzyishh said:
@Randy Holmes-Farley i have also been curious about Cal &Kh my KH is always at 7 or 7.5 and Cal is at 460-480 is that ok I run LPS 29g dominated by acans

Those values are fine, and you could dose both parts equally or let the calcium decline a bit before dosing more.

Personally, I'd stick with equal dosing unless calcium actually got too high (say, 550+ ppm). it is just easier, and if you let it decline, then need to dose, you may just find you are adding a lot of what you would have been added daily.

izzyishh · Mar 28, 2017

@Randy Holmes-Farley ok thanks you for the info!!!

Randy Holmes-Farley · Mar 28, 2017

You're welcome.

Happy Reefing. :)

Surfandturf · Apr 1, 2017

Randy Holmes-Farley said:
CO2 added or subtracted from the water has no impact on the alkalinity. How much alkalinity (in dKH per day) are you currently dosing?

1.25 mililiters. Its the 2nd part of the 2 part.