· Premium Member
Seachem Equilibrium will not lower the pH. It affects the GH, not the KH. You could try peat moss in the filter to lower the KH. I haven't tried it, but several people posting here have found it to be effective. Or, if you aren't trying the EI fertilizing method you could dilute the tap water with RO/DI or distilled water, sold at grocery stores for about a dollar a gallon. You would need about $50 worth to get the KH reduced by half, but you wouldn't have to do weekly water changes, so it would be a high one time cost, followed by small costs to maintain the lower KH.