Rapidly dropping Alk, with only 3 frags in a 90g

[HolisticBear]

Thanks again @Randy Holmes-Farley

 

[dankreef]

Interesting . I just thought my corals were sucking it down. I'm at like 8.45 ph with a CA reactor dripping fast and it barely keeping up with about 50 frags could explain why

 

[Randy Holmes-Farley]

pH 8.45 would be unusually high for a reef tank with a CaCO3/CO2 reactor.

Are you actively working to keep the pH high?