pH = 8.7, carbonate hardness = 6 dkh

[weileong]

Will the pH go down or go up?

----

dunno why nowadays brains and fingers work differently. I meant to say the pH is 8.57.

[BarraCudaTM]

most likely UP

[dradttg]

I dont think there will be any impact.

I started my tank with pH 8 and dKH 8.

I have been buffing up my dKH and now it is 11 dKH but my pH is still 8.

[kschew1498]

Correct me if I am wrong, I thought dkh & pH are proportionally increase with each other !??

Unless I was mis lead!! I was actually looking for a test kit to measure pH but this guy from S*a Lif* told me to buy dkh and he even write me a table to determine pH when dkh is measure!!!

6 dkh : 8 pH

8 : 8.1

10 : 8.2

12 : 8.3

14 : 8.4

Is this true!! Looks like you guys measure them separately! Appreciate your guys advice!

[Tanzy]

You cannot directly correlate pH and dKH in seawater. It's too complicated and there are too many factors to take into consideration. With increased dKH there is a general trend for the water to stabilise at 8.4. pH fluctuates in the tank so always measure before lights on and just after lights off to get the pH range of the tank.

With a dKH of 6 I won't be surprised if the pH is at 8.7 after lights off and maybe as low as 7.8 before lights on.

[weileong]

that big change will definately stress my poor fishes.

Dosing of kH buffer in progress, will take a few days to get it up to 10 dkh. Let's see how it turns out.

[weileong]

measured the pH just before I came to work and true enuff it was 7.9. Need to boost up the kH heheh.

[dradttg]

Correct me if I am wrong, I thought dkh & pH are proportionally increase with each other !??

Unless I was mis lead!! I was actually looking for a test kit to measure pH but this guy from S*a Lif* told me to buy dkh and he even write me a table to determine pH when dkh is measure!!!

6 dkh : 8 pH

8 : 8.1

10 : 8.2

12 : 8.3

14 : 8.4

Is this true!! Looks like you guys measure them separately! Appreciate your guys advice!

It is true.

I have a digital pH tester for testing you know what and a KH tester for testing dKH.

I dont know what happen I can never seem to get my pH up.

[jc85]

Wat's the amount of dkh that we shoudl maintain in a reef tank? Is it 10 or 15? I read from somewhere they suggest 15dkh.

Pls advise.

[Tanzy]

dradttg,

It is not true. As I have said before, pH is a range and I can get different pH values when measured at different times of the day. There will not be a chart where you can read off pH corresponding to the dKH unless your tank is just water with nothing else. As dKH increases, the pH range gets smaller.

jc85,

Anything above 8 is good. Never higher than 12.

[jc85]

Thanks Tanzy.