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Magnesium sulphate
From The Aquarium Wiki
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[edit] About Magnesium sulphate
Magnesium sulphate (Epsom salts) (MgSO4) : Provides Magnesium (Mg) for feeding aquatic plants and for increasing GH levels in water.
[edit] Feeding plants
To make a typical stock solution for feeding plants add 70g of dry MgSO4 to 500ml of RO or distilled water and then add once a week 50ml of this solution per 100L of tank.
This will give you 7ppm (7mg/l) of Magnesium.
- Also used in a ration of 1:3 with CaSO4 (Calcium Sulphate) (1 part MgSO4:3 parts CaSO4) to make your own GH mix for a freshwater aquarium.
[edit] Treating constipation
- Also used to treat constipated fish or fish suffering from dropsy as it is said to help fish expel excess water within their bodies.
- Typical treatment for fish is prepare a quarantine tank and add 1 tbsp per US gallon 1 US Gallons (3.8L) and immerse freshwater fish into it for 10-20 minutes up to a maximum of twice a day. Repeat this for a couple of days or until you notice the fish passing waste.

