How to control PH at night ?

[reefwars]

Originally Posted by Casey8

There is no chance for me to turn on the refugium light at night because the sump I have set up is beside my tank and it is located in my bedroom. Is it any alternative that I can control it ?

what are the readings ranging from?? its acceptable to drop a bit during the night and then raise in the morning/afternoon.

are you using a probe to get your readings?