Who Gives A Fish Forums

Let us know how it goes. If the coral doesn't cut it, you might need to look into a dedicated buffer like Seachem Alkaline or Acid Buffer, depending on which way you need to go.

First, check if your tap water's pH is consistent. Sometimes it fluctuates before you even add it to the tank. If it's stable, try adding crushed coral or aragonite to the filter. It'll slowly release minerals to buffer the pH.