pH Problems

[grubsnaek]

i have be running the sump light opposite my DT. shouldnt that help the pH swing from day to night.

 

[jasony]

my problem is that my ph is way too high.. its around 8.4-8.6.. how do i lower it?
i added salt to my tank 3 days ago..
the tank is 100 gallon.. i used 2 bags of instant ocean rated for 50 gallon per bag...
please help

 

[75bownut]

When it comes to Ph there are 3 things to check and maintain Calcium,alkalinity,and magnesium they work hand in hand and must be balanced. If you find one out of wack check them all. If adjustments are needed only tackle one at a time slowly. If anyone here is suffering from low PH its usually a good indicator that one or more of these is out of balance.