Rising pH

[clevan]

Thanks for all the help in the past guys!
New question: The pH in my FOWLR tank has dropped from 8.4 to 7.9 in 2 days, recently added a clown, cleaner shrimp, and 4 snails. I know about the water change but is this a normal drop and when should I be worried. Do I need to start adding supplements? Over feeding?
Thanks

 

[Anonymous]

Do you have skimmer? What type of circulation do you have in the tank? How do you measure the pH?

Probably due to CO2 if only thing you added was just livestocks.