high ph 8.8 to 8.9

[Yoyo]

I had 5×2×2.5ft tank.i having high ph 8.8.i had done 100% water change but my ph remain at 8.8.anyone can help me out?thank fỏr advance

[Guest]

What test kit are u using? Did u check if it has expire ? Do you dose kalk in your system?

[vkangster]

Are you using digital PH meter? Most digital PH meter needs calibration out of box.

[tropic]

I have a feeling he is using Colour strip.. I may be wrong though.

[ryanlio]

I dose natural vinegar..

http://reefkeeping.com/issues/2005-03/rhf/

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