Increase in PH

[jwill275]

My PH has jumped this week to 8.8. It's a new tank (6 weeks) but it's cycled and the ph has been rock solid between 8.2-8.4. Any reason why it would jump? Everything I read speaks to ph dropping.
thanks

 

[lion_crazz]

What are your other water levels looking like?

 

[jwill275]

everything else is fine - amonia 0 trites and trates 0 salinity 1.022

 

[lion_crazz]

Have you done anything differently to the tank? Added anything recently?

 

[jwill275]

added a piece of rock, Atlantic Coral, dead not live, 5 pounds

 

[lion_crazz]

Where did you get the rock and coral? Did you rinse it off thoroughly if it was sitting around somewhere?

 

[jwill275]

ought the rck from lfs - rinsed thoroughly - let it dry before putting in the tank. I have similar pieces and no problem, should I take it out?

 

[lion_crazz]

No, just asking, as unrinsed it could have been a problem. Anything else done to or around the tank, recently?
Do you test kH yet?

 

[sepulatian]

Have you added buffer to the water before? What kind of substrate do you have? Check the DKH, but even if that was high it would not cause the PH to rise. It would mean that you would have trouble lowering the PH should that need ever arise, which it won't.