Okay, two things to point out:
1. Your BPs will be fine at that pH. Don't mess with it, if they've been in there for a while they have gotten used to it and there is no need to move it. If you ABSOLUTELY have the desire to change it, I will only recommend you add a small amount of crushed coral into the tank gradually every day. CC is potent with pH and will raise it way fast if you add too much.
2. DO NOT use the pH up/down/raise/neutral/balance/etc. products you see at the store. Those contain harmful chemicals that can poison your fish. In addition they will cause massive pH swings if you add too much and can leave your fish in pH shock, making them more prone to disease.