Description
Quantum American/Aust MPMC GH 500ml — General Hardness Minerals for Cichlid and Native Fish Aquariums
A tank of oscars or big rainbowfish drinks minerals as fast as it dirties the water, and the 500 mL bottle keeps pace with a weekly change routine. Quantum American/Aust MPMC GH 500ml (SKU: QA360500) is the 500 mL size of Quantum’s American/Australian Pro Salt GH, a solution of major, minor and trace elements in deionised water formulated to raise general hardness gently and in the ratio of American lakes and Australian waterways. Macrobiotics, probiotics and vitamin precursors are included to promote beneficial bacteria and fish vitality, and it is designed to be used with American/Australian Buffer Pro for KH and pH.
Ten millilitres per 100 L raises GH by 1 dGH, with a recommended range of 2 to 4 dGH, and only the replacement water is dosed at a change. Taking 75 L of RO water to 3 dGH for a 300 L tank uses 22.5 mL, which gives the bottle about twenty-two weekly changes. Because many biochemical processes in the fish depend on magnesium and calcium, and because these fish draw much of it from the water rather than their food, the level is kept steady rather than allowed to drift down between changes.
Usage & Application
When to Use
- Mid-sized cichlid tanks: American cichlid communities of 200 to 400 L on weekly changes.
- Native displays: Rainbowfish, archerfish and gudgeon tanks kept moderately hard for colour and health.
- RO or rainwater users: Homes whose source water carries little general hardness.
- Completing the pair: Tanks already on American/Australian Buffer Pro that need the GH half.
Dosing & Administration Guide
- Target 2 to 4 dGH: Test and choose a level appropriate to the species.
- Calculate: 10 mL per 100 L for each 1 dGH of increase, on the water being treated.
- Dose the new water: Treat the bucket or barrel of replacement water, never the tank itself.
- Balance the triad: American/Australian Buffer Pro for KH and pH alongside this GH supplement.
Product Specifications & Highlights
Key Features
- Ideal element ratio: Major, minor and trace elements balanced for American and Australian waters.
- Vitality additions: Every dose carries macrobiotics, probiotics and vitamin precursors alongside the minerals.
- 10 mL per 100 L per 1 dGH: One figure that scales from a 100 L tank to a 1,000 L system.
- Supplies what fish absorb: Calcium, magnesium and trace elements taken up from the water.
- Partner to Buffer Pro: Completes the GH, KH and pH system for cichlids and natives.
Product Details
- Brand: Quantum (Freshwater Essential range)
- SKU: QA360500
- Barcode (GTIN/UPC): 793573028617
- Product Type: Additives & Supplements > Freshwater GH Mineral Salt
- Manufacturer Name: American/Australian 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 1 dGH; during a water change, dose only the volume replaced
- Target Range: 2–4 dGH
- Companion Product: American/Australian Buffer Pro pH | KH
- Support: Free Quantum Aqua dosing app with instructional videos
- Target Environment: American cichlid and Australian native freshwater aquariums


There are no reviews yet.