Description
Seachem Acid Buffer 70g — Non-Phosphate pH Lowering & Alkalinity Adjuster Needed for Soft-Water Fish Species in Freshwater Aquarium Tanks
Seachem Acid Buffer 70g (SKU: 724989-244) is a non-phosphate buffer designed to lower pH and convert carbonate alkalinity (KH) into available carbon dioxide (CO₂) in freshwater aquariums. Many soft-water fish species (such as tetras, angelfish, and South American cichlids) require acidic conditions to thrive. Acid Buffer provides a safe method to lower pH without introducing phosphates that cause algae blooms.
Seachem Acid Buffer 70g comes in a compact pack, which is ideal for fish species that prefer acidic to slightly acidic water, helping recreate natural soft-water conditions without introducing phosphates that can contribute to algae growth. The buffer allows controlled pH adjustment and can be used daily until the desired pH level is reached. It may also be used alongside Seachem Alkaline Buffer for more precise pH management when required.
As Acid Buffer lowers alkalinity, it converts carbonate ions into dissolved carbon dioxide gas, providing a secondary benefit by supplying usable CO₂ to aquatic plants. When used alongside Seachem Alkaline Buffer, it allows aquarists to set and maintain target pH levels between 5.0 and 8.0.
Usage & Application
When to Use
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Acidic Environment Setup: Ideal for creating soft, low-pH conditions for Amazonian community tanks and soft-water fish.
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Carbon Dioxide Conversion: Converts existing carbonates into dissolved carbon dioxide for plant uptake.
Dosing & Application Guide
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Add 1/4 teaspoon (approx. 2 g) for every 80 L (20 US gallons) daily until the target pH is reached. Dissolve before adding, or add directly to high-flow areas.
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Combine with Seachem Alkaline Buffer according to the targeted ratio chart for stable, fixed pH levels. Monitor pH regularly using a reliable test kit.
Product Specifications & Highlights
Key Features
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Phosphate-Free Formula: Safely lowers pH without feeding nuisance algae growth. Seachem Acid Buffer has a phosphate-free formulation, which reduces the algae-bloom risk in aquarium waters.
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Generates Plant-Available CO₂: Converts carbonate hardness into carbon dioxide to support plant health and helps maintain stable acidic water conditions
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Synergistic System: Pairs with Alkaline Buffer for predictable, fixed pH ratios. Compatible with Seachem Alkaline Buffer for fine-tuning pH levels.
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Ideal for Soft-Water Species: Helps replicate soft, acidic natural river habitats. Suitable for soft-water and acid-loving species (such as tetras, angelfish, and South American cichlids).
Product Details
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Brand: Seachem
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SKU: 724989-244 (Internal ID: 130735)
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Barcode (GTIN/UPC): 000116024402
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Product Type: Aquarium Water Conditioner > pH Decreaser
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Package Dimensions: 50 mm (L) × 50 mm (W) × 80 mm (H)
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Gross Package Weight: 95 g
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Net Weight: 70 g
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Target Environment: Soft-Water & Planted Aquariums
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Treatment Capacity: 70 g treats up to 2,800 Litres (700 US gallons)


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