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if you used mineral salts then it might have raised the PH. Likewise, rock salt or swimming pool salt will often raise the PH.
Your tap water might have changed and now have a higher PH.
If you added any shells, limestone or coral to the tank then that would also raise the PH.
Off the top of my head, it shouldn't.
The term "salt" means the balanced state of a mixture of alkanines and acids