Description
NT Labs Marine Lab Magnesium Mg 35 Tests
The essential water quality test for reef aquariums. Magnesium analysis for invertebrate health and water stability. Titration test for precise and accurate results.
Contains 35 tests
What is magnesium?
Magnesium is a the second-most abundant cation found in natural seawater. Magnesium is essential for the efficient assimilation of calcium by marine invertebrates.
Why test for magnesium?
Without the correct levels of magnesium, corals and invertebrates cannot properly or efficiently utilise calcium for the formation of their shells and growth of skeletons. Sufficient magnesium also prevents precipitation of calcium and carbonate ions, ensuring bioavailable calcium and a pH stabilising effect. As magnesium tends to deplete with the age of the water, monitoring the magnesium frequently is the only reliable method to determine the concentration present in the water.
What is the correct level of magnesium?
The average magnesium level in natural seawater is 1300-1400 mg/l. Equally importantly, the correct ratio between magnesium and calcium should be achieved. The concentration of magnesium should be 3 times that of calcium (e.g. a magnesium to calcium of 3:1).
What to do if the magnesium level is wrong?
If the magnesium concentration in your aquarium is wrong, partial water changes using a good quality reef salt is recommend to help re-establish the correct magnesium concentration. It is also important to check the calcium and KH as the three are correlated. If the magnesium is incorrect, calcium and KH are also likely to be wrong.
In stock orders placed before 2pm will be despatched on the same working day (not including palletised items, pond plants or fibreglass ponds).
Pre-orders are shipped once we have the stock available and will be shipped using the service chosen at checkout.
All services are working day services and do not include delivery on Saturdays and Sundays or public holidays as standard. Deliveries are usually Monday to Friday only, although some Royal Mail items may be delivered on weekends as standard if the service is available in your area.
SERVICE | SPEND | COST |
Packet/Courier items | ||
Royal Mail (2-3 days) | £0.00-£49.99 | £2.99 |
Royal Mail Next Day (1-2 days) | £0.00-£49.99 | £4.99 |
Parcelforce 24 (1 day) | £0.00-£49.99 | £7.99 |
Parcelforce 24 (1 day) | £50 and up | FREE |
Pallets (booked in) | aquariums / bulky items | |
Pallets Standard (3-5 days) |
- | FREE |
Pallets Express (1-2 days) |
- | £39.99 |
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*EXCLUDED ITEMS | extra delivery fees apply: | |
Fibreglass Ponds (booked in) | ||
Zone 1 (7-10 days) |
- | £79.99 |
Zone 2 (7-14 days) | - | £149.99 |
Zone 3 (7-21 days) | - | £249.99 |
Pond Plants (direct from grower) |
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All pond plants (3-10 days) | one-off fee regardless of order size/value | £5.99 |
Please see our full delivery information page and terms and conditions for detailed information on shipping policies and zones