Description
Quantum Amazon River MPMC GH 500ml — Soft-Water GH Minerals for Discus and Amazon Community Tanks
Discus that refuse to eat in pure RO water often perk up once a little general hardness is restored, because the minerals matter to the fish as much as the softness does. Quantum Amazon River MPMC GH 500ml (SKU: QA340500) is the 500 mL size of Quantum’s Amazon River Pro Salt GH, a solution of major, minor and trace elements in deionised water formulated to raise GH gently and in the ratio of Amazon river water. Macrobiotics, probiotics and vitamin precursors are included to promote beneficial bacteria and fish vitality, and it is designed to be used with Amazon River pH Pro and Amazon River KH Pro.
Ten millilitres per 100 L raises general hardness by 0.5 dGH, with a recommended range of 1 to 3 dGH, and only the replacement water is dosed at a change. Taking 75 L of RO to 2 dGH for a 300 L discus tank uses 30 mL, which gives the bottle about sixteen weekly changes; a planted tank held at 3 dGH uses a little more. Many biochemical processes in the fish depend on magnesium and calcium, and in soft water this bottle is the only place those elements come from.
Usage & Application
When to Use
- Mid-sized soft-water tanks: Discus, angelfish and tetra communities of 200 to 400 L.
- RO and rainwater keepers: Homes whose source water carries no general hardness of its own.
- Breeding pairs: Apistogramma and discus set-ups where mineral balance affects fry.
- Completing the Amazon set: Tanks already on pH Pro and KH Pro that need the GH half.
Dosing & Administration Guide
- Target 1 to 3 dGH: Choose a point that suits the fish and any plants, and hold it at every change.
- Calculate: 10 mL per 100 L for each 0.5 dGH of rise, on the water being treated.
- Dose the new water: Treat the replacement volume only, then proceed with the change.
- Keep the triad balanced: Amazon River KH Pro and pH Pro alongside.
Product Specifications & Highlights
Key Features
- Ideal soft-water ratio: Major, minor and trace elements balanced for the Amazon.
- Vitality additions: Macrobiotics, probiotics and vitamin precursors in the formula.
- Fine control: 0.5 dGH per 10 mL per 100 L, for small adjustments at low hardness.
- Bioavailable minerals: The calcium and magnesium fish absorb from the water.
- Three-part partner: Runs with Amazon River pH Pro and KH Pro in the same change water.
Product Details
- Brand: Quantum (Freshwater Essential range)
- SKU: QA340500
- Barcode (GTIN/UPC): 0735204321513
- Product Type: Additives & Supplements > Freshwater GH Mineral Salt
- Manufacturer Name: Amazon River Pro Salt GH
- Net Volume: 500 mL
- Contents: Deionised water, major, minor and trace elements, macrobiotics, probiotics, vitamin precursors
- Dose Rate: 10 mL per 100 L raises GH by 0.5 dGH; during a water change, dose only the volume replaced
- Target Range: 1–3 dGH
- Companion Products: Amazon River pH Pro; Amazon River KH Pro
- Support: Free Quantum Aqua dosing app with instructional videos
- Target Environment: Amazon and soft-water freshwater aquariums


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