Step-by-step
Step 1: Test current pH + KHpH and KH (carbonate hardness) are linked - higher KH stabilizes pH against changes. Test both. If KH is high, you must lower it before pH drops.
Step 2: Add driftwoodDriftwood releases tannins + humic acid that lower pH naturally. 1 piece per 20 gallons. Boil first to remove dirt; soak 1-2 days before adding to remove initial dust.
Step 3: Add Indian almond leaves1-2 leaves per 10 gallons in the tank. Tannins lower pH gradually + boost fish immune response. Replace monthly as they break down.
Step 4: Add peat moss to filterPlace 1 cup of aquarium-grade peat moss in a media bag in your filter. Lasts 6-8 weeks. Peat lowers KH + pH simultaneously.
Step 5: Use RODI for water changesRODI water has 0 KH/GH so weekly changes lower the buffering capacity gradually. Avoid sudden pH crashes.
Step 6: Monitor over 2 weeksTest pH + KH every 3 days. Target: drop pH by 0.1-0.2 per week. Faster drops shock fish.
Step 7: Avoid chemical pH downAPI pH Down +
Seachem Acid Buffer work but crash KH. Once KH is gone, pH swings wildly between water changes. Use only as a last resort and always pair with a buffer.
Frequently asked questions
How fast can I lower pH safely?
0.1-0.2 pH units per week maximum. Faster drops cause fish to lose slime coat and develop secondary infections.
Will driftwood lower pH alone?
Yes, by 0.2-0.5 pH over weeks. Combine with peat + Indian almond leaves for stronger effect. The wood needs to leach for 2-4 weeks before maximum effect.
Why does my pH always rise back up?
High KH (carbonate hardness) buffers against pH change. You must lower KH first using RODI water for changes + peat moss in the filter.