I am cycling a new tank so don't yet have fish. I am planning to add tetras, rasboras, corys, and other soft water fish. While my water is soft (81 ppm or 4.5), I tested the pH in the tap water and it is 7.9 which is higher than most soft water fish prefer. Will they do OK and "get used to it" or do I need to do something to try and bring and keep it down? Thank you!