Lower pH after adding dry rock to sump

[Danyole]

65G mixed reef system thats been running for 2 years. I’m not chasing numbers and all my other parameters are normal and coral/fish are fine just wondering if there’s any correlation.

I’ve been playing with the idea of starting a 7G sexy shrimp tank so I tossed about 5lb of dry rock in my sump to seed. Ever since then my pH is barely peaking 8.1 when before that it was over 8.3 everyday

Any ideas?

 

[Randy Holmes-Farley Verified Community Expert]

Did alk drop? Are calcium carbonate can act as a site for precipitation of calcium carbonate, which will lower pH