Description
Aqua-Pics Amazon KH Buffer 400g — Season-long KH stability for soft-water community tanks
A soft-water community tank that has been stable for a year did not get that way by accident, it got there by having carbonate hardness replaced every time water changed. Aqua-Pics Amazon KH Buffer 400g (SKU: 102033) is a mineral buffer from Aqua-Pics (Australia) formulated to raise carbonate hardness (KH) while holding pH in the slightly acidic 6.5 to 6.8 range that discus, tetras, Apistogramma and L-number catfish are kept in. The formula carries chemically clean phosphates rather than being phosphate-free, which the maker states should not add to algae problems. At 400 g it is sized for an established single tank running regular water changes well beyond a single season.
The dose is 1 level teaspoon, about 5 g, per 8 L, raising KH by roughly 6 dKH (107 ppm) and settling pH around 6.5 to 6.8. A 400 g tub treats about 640 L in total at that dose, enough for frequent water changes on a mid-size tank for the better part of a year. It is the midpoint of seven sizes, between the 250 g tub and the 800 g pack.
Usage & Application
When to Use
- Established soft-water tanks: Keeps KH topped up so pH does not drift down over time.
- Discus and tetra tanks: Matches the 6.5 to 6.8 range these fish are kept in.
- Weekly or fortnightly water changes: Re-dose each time to replace buffering capacity used up.
- Apistogramma and L-number tanks: Suits the same gently acidic target.
Mixing & Application Guide
- Standard dose: 5 g (1 level tsp) per 8 L for about 6 dKH (107 ppm).
- Target pH: Settles around 6.5 to 6.8 at this dose.
- Test before dosing: Check current KH and pH to confirm the tank needs topping up.
- Dissolve first: Mix into a jug of water before adding, rather than dosing dry.
Product Specifications & Highlights
Key Features
- Soft-water target: Holds pH at 6.5 to 6.8 rather than neutral.
- Chemically clean phosphates: Included, with the maker stating it should not add to algae.
- Single dose rate: 5 g per 8 L, consistent across every water change.
- Year-length supply: Treats roughly 640 L at the standard dose.
- Midpoint size: Between the 250 g tub and the 800 g pack.
Product Details
- Brand: Aqua-Pics (Australia)
- SKU: 102033
- Barcode (GTIN/EAN): 9336264004067
- Product Type: Additives & Supplements > Freshwater KH Buffer (Amazon Biotope)
- Net Weight: 400 g
- Dose Rate: 5 g (1 level tsp) per 8 L
- Treatment Capacity: About 640 L at the standard dose
- Target KH & pH: About 6 dKH (107 ppm); pH 6.5 to 6.8
- Contains: Chemically clean phosphates (not a phosphate-free formula)
- Ideal For: Discus, tetras, Apistogramma and L-number catfish
- Other Sizes: 120 g (SKU 112965), 250 g (SKU 102032), 800 g (SKU 102025), 2 kg (SKU 102842), 4 kg (SKU 102843), 16 kg (SKU 113044)
- Target Environment: Soft, slightly acidic Amazon Basin biotope aquariums


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