Just wondering if anyone has any experience with their pH getting really high (9.0) during the day and dropping back down to 8.3 at night. I am having this issue and I don't know how to stop it. I had the red algae "Macro Feast" by reef nutrition in my tank. I removed it thinking the plant was taking all of the CO2
out of the tank and causing the swing. The plant has been out for 2 days now and I am still getting the swings. My Alkalinity is at the lower end of the "normal" range. I am wondering if I should wait it out, add pH down when the pH is high or add Alkalin8.3 (buffer) when the pH is normal to help lock the pH in place. Any suggestions would be great. I do have some livestock and I am trying to avoid killing everything from the pH swings.
Thanks in advance for advice.
16.75 gallon tank
30 lbs of LS
22 lbs of LR
2 power heads
Alkalinity 1.7 meq/l
pH swinging between 8.3 and 9.0