PH Not Reading?

Waffen06 · Nov 29, 2020

Picked up an Apex EL last weekend, been going well till last night. At 2:00 am my PH probe read 8.0 and stayed till 10 when I reset the apex and unplugged/plugged back in now its at 7.99 and wont move. Any suggestions?

WIReefer · Nov 29, 2020

Was it a brand new apex and probe? @SuncrestReef will help.

Garf · Nov 29, 2020

Waffen06 said:
Picked up an Apex EL last weekend, been going well till last night. At 2:00 am my PH probe read 8.0 and stayed till 10 when I reset the apex and unplugged/plugged back in now its at 7.99 and wont move. Any suggestions?

Not got an Apex so just a wild shot, but are you reading a trigger point or something, and not the actual pH?

Waffen06 · Nov 29, 2020

WIReefer said:
Was it a brand new apex and probe? @SuncrestReef will help.

Yes brand new, only a week old

I bought more calibration fluid but was looking for any input before trying that

Waffen06 · Nov 30, 2020

Ok so I did a recalibration on the PH probe. After it was finished I cleaned off the probe and put it back in the 7 PH and 10 PH solution and got exact readings on both. Put the probe back in my tank and it went from the 8.00 it had been for 12 hours to 8.05 then started dropping down to 7.82 by midnight and that is where it has stayed since (9 hours from the time Im writing this). I dont have a fuge or an automatic doser so my PH should not be able to flat line. Think its a bad probe?

William Mumford · Nov 30, 2020

Waffen06 said:
Ok so I did a recalibration on the PH probe. After it was finished I cleaned off the probe and put it back in the 7 PH and 10 PH solution and got exact readings on both. Put the probe back in my tank and it went from the 8.00 it had been for 12 hours to 8.05 then started dropping down to 7.82 by midnight and that is where it has stayed since (9 hours from the time Im writing this). I dont have a fuge or an automatic doser so my PH should not be able to flat line. Think its a bad probe?

Your ph will drop at night. As well as with windows and more co2 being used not used around the tank. Could you use a pin point ph monitor or a back up to see if that is fluctuations you are having.

Waffen06 · Nov 30, 2020

William Mumford said:
Your ph will drop at night. As well as with windows and more co2 being used not used around the tank. Could you use a pin point ph monitor or a back up to see if that is fluctuations you are having.

Only other way to test PH is an api test