How do I fix pH

itsnicholas · Jun 8, 2025

During the night time, my PH is around 7.8-7.7. However, during the day it is around 8.1-8.2. I am starting to see my PC rainbow SPS turn white and my fox flame SPS starting to turn a little white on one side. What can I do to fix this? I am dosing kalk as well. Should I have a co2 scrubber or have chaeto in my sump with the grow light on only at night? I do not want the chaeto to drop my nitrates.

BlueBayouReefHTX · Jun 8, 2025

I don’t see an issue with your pH.
The bleaching could be attributed to lighting or your tank parameters.

azreefer93 · Jun 8, 2025

Your PH is absolutely fine. Mine is 7.7 at night and 8.0 - 8.1 at the end of the light cycle too. Coral growth without any issue. Acropora turning white could be STN or RTN or stress caused by parameter swing or even Acropora Eating Flatworm... Or maybe they starve if you are bottom out the nutrient (N and P) for a while.
Hope that help.

Dburr1014 · Jun 9, 2025

itsnicholas said:
During the night time, my PH is around 7.8-7.7. However, during the day it is around 8.1-8.2. I am starting to see my PC rainbow SPS turn white and my fox flame SPS starting to turn a little white on one side. What can I do to fix this? I am dosing kalk as well. Should I have a co2 scrubber or have chaeto in my sump with the grow light on only at night? I do not want the chaeto to drop my nitrates.

Your issues do not sound like a PH problem.
But, how are you testing PH and was the device calibrated?

What else have you tested?
List what you can. Even the salinity.

itsnicholas · Jun 9, 2025

azreefer93 said:
Your PH is absolutely fine. Mine is 7.7 at night and 8.0 - 8.1 at the end of the light cycle too. Coral growth without any issue. Acropora turning white could be STN or RTN or stress caused by parameter swing or even Acropora Eating Flatworm... Or maybe they starve if you are bottom out the nutrient (N and P) for a while.
Hope that help.

I have some worms that grew on the back of my tank and in my sump. On a lot of my corals I'm also seeing these long worm-like things pop up. Some look like little flowers like they sprouted, others not so much. The corals seem to be doing well, its just the PC rainbow and my fox flame. Any idea what these are and how to get rid of them?