ZOMG my pH is 8.65!! (Solved:bad calibration solution)

Not quite sure about why your PH is climbing but I would definitely take Steve's advice as this seems like a good start. Also your Mag. is low. If your Calcium is at 527 your Mag. should be around 1550.

 

I use the Pinpoint probe with Apex. For calibration, I use this solution:

Yo Vinny! Yeah I know the Mag is a bit low. Im calibrating the probe right now

 

I'm interested to see what the problem turns out to be in case I have this problem later down the road.

 

Ive done calibration.
It shows 7.0 spot on with the 7.0 solution AFTER the calibration:

And 10.0:


Ill update with the chart again tomorrow. I really hope it's just the probe calibration issue.

 

Good news exactlyobp

I know I should know this
but what is your current lighting and lighting period?

as I find if I go beyond 10 hours of MH on my set up, my PH will drift above 8.3

Steve

 

That would be awesome if that is all it is. Maybe a bad probe though. I guess it could be drifting in between calibrating it.

 

This is my photo cycle, all LEDs:


How do I determine that I have a bad probe? It shows 7.0 and 10.0 with the solutions after the calibration. I really hope it's a bad probe but if it's working fine I dont wanna toss it?

It's showing 8.45 right now, which is exactly the same value right before the calibration...

 

Is B time on and C time off - what is D ?


possibilities

do you rinse the probe in distilled or RODI water between each solution?
how old are the solutions?
is there any possibility that the solutions have become diluted over time due to not drying probe between solutions?
is there any possibility that the PH 7 solution has been compromised by the pH 10 solution? or vice versa?

because if for example you have changed the PH of the calibration fluids
you set the probe to read 10 - but in actuality the solution has a PH of under 10? you can see where that would lead to - the probe would be giving you a higher reading than the reality

 

B is on, C is off and D is duration. RB is 11 hours on per day, UV is 9.5, and white is 9 hours.

I made sure that there was no cross contamination between 7.0 and 10.0 solutions. If there was any, it shouldve shown some inconsistency, but none. And I use RODI to rinse. After each rinse, I discarded the water. I made sure that I rinsed the probe and dried it gently each time.

Ive purchased the solution Jan 2012 online. The lids were never left open. Always out of reach of my kid.

 

High pH: Causes and Cures by Randy Holmes-Farley - Reefkeeping.com

your routine sounds good to me, as does your light up period

hopefully the above article will help you find route cause of issue
and will certainly help with possible solutions

A Comparison of pH Calibration Buffers by Randy Holmes-Farley - Reefkeeping.com
also check out this study of calibration fluids
becuase if the one marked 10 is lower than 10, that would explain why your tank PH is showing to high