PH swing

[moiy24]

My PH at night is dropping down to 7.50 or lower then raises again during the day i imagine its because of the reverse schedule of the refugium, i started running my skimmer air line to the outside to get my ph higher it helped but only goes up to 8.1
What can i do to prevenet these swings?

I have a 210 gal mixed reef

Parameters are
8.5 alk
420 ca
Nitrates 0
I calibrated my probe 2 weeks ago

Been dosing 2 part for almost a year now.

60ml ca and 70ml alk

 

[mtraylor]

Mine goes between 7.59 and 7.9. I have seen swings upward of like .4 that are ok. What does the last 3 to 4 days look like? I run the refuge light at night to try and help counter act the swing....but the swing is normal and expected as long as it doesn't get too out of wack.

 

[moiy24]

Mine goes between 7.59 and 7.9. I have seen swings upward of like .4 that are ok. What does the last 3 to 4 days look like? I run the refuge light at night to try and help counter act the swing....but the swing is normal and expected as long as it doesn't get too out of wack.

The last 3 days have been the same.. at night it goes to 7.5.-7.7 and at day between 7.8-8.1

 

[mtraylor]

You are around .3 to .35 swing which to me is normal and not an issue. I will let others chime in, but that is where my aquarium resides.

 

[BoomCorals]

I was 7.7-7.9 and used a DIY CO2 scrubber that runs to the air intake on my skimmer. Now I get 8.1-8.3. That plus the kalk in my ATO helps keep my ph up as well as alk and CA.

Coral, especially sps, like ph at 8.1-8.3

 

[moiy24]

Just checked and my apex probe was dry, my tunze sensor wasnt turning on with low water. Second time it happens.. Any way to fix it?

 

[vic5hands]

Had the same problem. Installed a Kalkwasser stirrer on my Ato problem solved. Doesn't go below 8.0