pH is increasing and is not stopping

[leonardomanzano]

These past few days my pH has been increasing non stop, I have not dosed my tank with anything lately.
I have done x2 5 Gallon water changes on my tank within those 3 days where the pH started increasing.

My dKH, Magnesium and calcium have not fluctiuated that much in those 3 days.

I have recently beaten my battle with dinos, I have a current diatom issue that I am taking care of with water changes as I dosed a lot of silicates to help fight the dino issue.

aside from taking out ditritus and adding Polyp booster, AB+ and reef roids and the water changes there has not been any additive induced chemical changes in my tank.

Is my tank going to crash at the rate my pH is going?

I increased surface agitation on both my display tank and the sump.
The room this tank is in has an open window all day except for at night.
I do not have any reactors or media running at the moment.



edit: I also want to note that a few months ago my main display tank broke while I was drilling it so I had to transfer everything to my quarantine tanks (This tank now)
Unfortunately I could not fit my corals in the one quarantine tank so I converted the sump into its own tank so I could have a place to put the rest of the corals.
Both tanks have their own separate lighting schedule.

The bottom light turns on 30 minutes before the top light turns off and in the morning the top light turns on 30 minutes before the bottom light turns off.

 

[gbroadbridge]

Have you cleaned and recalibrated the pH probe?
I suspect a measurement error.

 

[ReefingDreams]

Your PH probe is giving a bad measurement. There is no other answer if you aren't dosing anything. Your numbers are ridiculously high and have been incorrect prior to when you started seeing those spikes.

 

[Garf]

You got something green growing on your probe?

 

[buruskeee]

Check with another manual tester. Even an API kit will give you an idea of what is accurate. I never rely 100% on my Apex.

 

[Randy Holmes-Farley]

I agree that pH that high is a test error.

 

[leonardomanzano]

Have you cleaned and recalibrated the pH probe?
I suspect a measurement error.

You got something green growing on your probe?

Now that I think about it there is a chance the probe light could have diatoms growing on it.
I'll need to take a look at the bulb at the bottom as well.

Your PH probe is giving a bad measurement. There is no other answer if you aren't dosing anything. Your numbers are ridiculously high and have been incorrect prior to when you started seeing those spikes.

I agree that pH that high is a test error.

Thank you all for your input!
I ordered some pH probe calibrating powders to get my pH probe back to its normal readings!