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https://www.swelluk.com:443/seachem-reef-advantage-magnesium/ 
Seachem Reef Advantage Magnesium
Seachem Reef Advantage Magnesium helps top up the important levels of magnesium on your reef aquarium, giving your corals an essential element they need to grow and develop in a healthy manner. Ammonia free, this can really make a positive difference in your aquarium.
Products
Product Information
Seachem Reef Advantage Magnesium is a concentrated (80,000 ppm) optimised blend of magnesium, chloride, and sulphate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea water.
If depleted these levels can affect pH and calcium levels. So, it's important to regulate the amount of magnesium. Seachem's Reef Advantage Magnesium will ensure that corals and other organisms have just the right amount for healthy balance and growth. Unlike many other magnesium supplements, it doesn't contain ammonia. So you can be confident of both great water quality and fish health.
Key Features:
- Contains magnesium, chloride, and sulphate salts
- Promotes healthy balance and growth of corals
- No ammonia
Dosage: Use 5g (one level teaspoon) per 80 litres / 17.6 gallons, twice a week. Dissolve in at least 250ml of freshwater.
Latest Customer Reviews
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Rating Date 07/09/2017 07:09am Seachem Reef Advantage Magnesium 2.2kg
Good response from corals -
Rating Date 18/02/2017 21:02pm Seachem Reef Advantage Magnesium 600g
Good produce, it raises the magnesium quickly and mixes well. -
Rating Date 12/10/2016 09:10am Seachem Reef Advantage Magnesium 600g
As above !!!!!!!!!!!!!!!!!!!! -
Rating Date 13/09/2016 08:09am Seachem Reef Advantage Magnesium 600g
Simple to use....erring on the side of caution. -
Rating Date 30/08/2016 12:08pm Seachem Reef Advantage Magnesium 300g
Excellent -
Rating Date 26/08/2016 01:08am Seachem Reef Advantage Magnesium 600g
Seachem quality as always -
Rating Date 20/05/2016 07:05am Seachem Reef Advantage Magnesium 600g
Essential item for any serious aquarist (not much to say except it mixes well) -
Rating Date 26/01/2016 16:01pm Seachem Reef Advantage Magnesium 600g
I have no way of comparing with other equivalent products so not in a position to say excellent. -
Rating Date 16/04/2015 17:04pm Seachem Reef Advantage Magnesium 2kg
Excellent -
Rating Date 09/03/2015 21:03pm Seachem Reef Advantage Magnesium 300g
As Above -
Rating Date 21/02/2015 10:02am Seachem Reef Advantage Magnesium 4kg
Good -
Rating Date 22/01/2015 17:01pm Seachem Reef Advantage Magnesium 600g
Can't say much yet as I've only just started to use it. -
Rating Date 10/01/2015 09:01am Seachem Reef Advantage Magnesium 600g
Does what its meant to. -
Rating Date 14/11/2014 19:11pm Seachem Reef Advantage Magnesium 4kg
I've used this product before and liked it, but this particular pack was damp, so the chrystals had clumped together into a lump.