PH Rising??

grr410 · Oct 16, 2023

Hey everyone...
Question on rising PH in my tank. Tank is almost 1 yr old and recently had a cynobacteria (red slime) outbreak, which killed corals (hammers and torches), but zoas and shrooms did ok. I treated with red slime after about a month of trying to figure it out on my own.
Since then and some tuning of my skimmer my PH has been fluctuating between 8.2-8.45 over the past 3-4 days. Normally, my PH has been between 7.9-8.2 throughout the day. Any suggestions on how to normalize or bring it back down? Could it be due to the tuning of my skimmer (NYOS 120) I feel like it keeps rising then dropping but steadily increasing throughout the day.

Parameters:
Red Sea 200XL
Nitrates 8.5
Phosphates .02
Alk 9.0
Salinity 1.025
**all testing is w/ Hanna checkers and I have not measured Mag or Calcium in a while***

blaxsun · Oct 16, 2023

Most people would kill for pH levels like that (especially without a Co2 scrubber which I assume you don't use), so enjoy your coral growth!

CasperOe · Oct 16, 2023

blaxsun said:
Most people would kill for pH levels like that (especially without a Co2 scrubber which I assume you don't use), so enjoy your coral growth!

Exactly my thought! I was like "what's the problem"

Spare time · Oct 16, 2023

Have you been opening windows? It could also be a calibration issue

Sisterlimonpot · Oct 16, 2023

I think the concern here would be to ensure that the pH probe is properly calibrated.

If it is, then keep doing what you're doing.

blaxsun · Oct 16, 2023

pH will also fluctuate quite a bit during the day. My low is at 6am and my peak is just after 6pm.

68 Stang · Oct 16, 2023

FYI, One thing I learned recently was my PH began rising higher than normal and after a couple of days had a Dino outbreak.

grr410 · Oct 16, 2023

Ok I appreciate the feedback I guess I will monitor and see what happens.

Sisterlimonpot · Oct 17, 2023

grr410 said:
Ok I appreciate the feedback I guess I will monitor and see what happens.

How long has it been since you calibrated the probe?

Estonian Reefer · Oct 17, 2023

I can't see the reasoning to bring that kind of PH levels down. Those pH levels are beneficial. Did you change anything or started adding anything to bring big value up? I can tell you that with certainty that skimmer tweaking wouldn't make such a big pH jump. There's also consideration on faulty test kit readings.