New products


Aquavitro ions 1000ml View larger

Aquavitro ions 1000ml


New product

ions restores magnesium and does so without adding any ammonia.

More details

£ 43.99

More info

Aquavitro ions 1000ml

  • Restores magnesium by employing the most concentrated (90,000 mg/L), fully dissolved magnesium
  • First and only liquid magnesium supplement that does not contain ammonia

Like calcium and strontium, magnesium is used in the calcification of skeletons of reef organisms. In many cases, magnesium is used in place of calcium for calcification. In addition to its role in calcification, magnesium is used by organisms ranging from bacteria, to coralline algae to fish.


Beginner: Use 5 mL for every 90 L (25 US gallons) twice a week. Check magnesium once a week and adjust amount or frequency accordingly. Note: each inner cap thread is approximately 1 mL.

Advanced: Check magnesium level, then follow addition regimen above until magnesium is adjusted to 1200-1350 mg/L. Each 5 mL/90 L (25 US gallons) will raise magnesium by about 5 mg/L. Quantity or frequency can be adjusted, but do not exceed 25 mL/90 L (25 US gallons) per day. Thereafter, use as required to maintain magnesium.

Unlike competing products that require multi-day interval dosing. ions™ can be dosed daily and within minutes of the entire aquavitro line.


Q: My tank only has a magnesium level of 1050 mg/L. I have been using ions™ daily for the past week and my magnesium level is not increasing very much. Do you know why this is?

A: Each standard dose of ions™ will raise magnesium by 5mg/L. In cases where magnesium is severely low, it is acceptable to add up to 5X the recommended dose each day in order to see a more notable increase in magnesium. Unfortunately, it will take a large quantity of any magnesium supplement in order to increase magnesium by such a large amount (about 300mg/L in your case). For the future, you may want to look into using a salt that contains a more appropriate level of magnesium, such as our salinity.

Q: What if I want to raise strontium without raising magnesium

A: Strontium use by corals is not completely understood; much of its use seems linked to temperature or the absence of calcium in systems. It is a factor in the stability in the skeletal systems of corals. Typically, its rate of utilization will not exceed the rate of magnesium utilization. So ions™ offers a continuous supply necessary for all systems. So will it build up? No, it shouldn’t, but if it does, there is a margin of safety of 10X natural seawater for strontium. Any normal water change would negate this concern. If one wanted to run elevated levels of strontium, by all means use Reef Strontium™.

Q: Do you still have a second seal on the ions bottles, 150 mL, 350 mL?

A: No, we have actually used a special cap style on the aquavitro line that prevents the need for an additional seal. The cap will seal tightly once closed.

Aquavitro - A Premium Line by Seachem

Trusted Shops Reviews