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Tropic Marin

Block Molybdenum Concentrated Solution

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SKU
256717
$40.57 $40.57

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Concentrated Molybdenum, Rubidium, Vanadium, Tungsten, Tellurium, and Hafnium

  • Adds Molybdenum, Rubidium, Vanadium, Tungsten, Tellurium, and Hafnium
  • Restores Trace Elements When Below Ideal Levels
  • Easy and Accurate Dosing with Dropper Cap
  • Dose Manually or with a Dosing Pump

 

Tropic Marin Block Molybdenum makes it simple to maintain balanced levels of molybdenum, rubidium, vanadium, tungsten, tellurium, and hafnium in your reef aquarium. These elements support the metabolism of corals and other marine animals as well as the ionic balance.

The Block System is designed to replenish these elements together in the right proportions. Each solution in the system targets related elements that are typically used up at the same rate, helping you keep your aquarium chemistry balanced without complicated testing or guesswork.

Elements, Chemical Symbol and Contents:

  • Molybdenum (Mo) – 150 mg/l (ppm)
  • Rubidium (Rb) – 150 mg/l (ppm)
  • Vanadium (V) – 60 mg/l (ppm)
  • Tungsten (W) – 0.75 mg/l (ppm)
  • Tellurium (Te) – 0.15 mg/l (ppm)
  • Hafnium – 0.15 mg/l (ppm)

 

What Are These Elements Used For?

Molybdenum, Vanadium, and Tungsten: Associated with key conversions in the metabolism of corals and other marine animals and algae.

Rubidium: Important for the ion balance.

Tellurium and Hafnium: Trace elements in seawater, but their function is not yet known.

 

Dosing Information:

For best results, use Tropic Marin Block Elements in combination with Tropic Marin ICP Water Analysis to accurately identify and correct trace element deficiencies.

2 ml per 26 gallons (100 liters) of aquarium volume increases the concentration of molybdenum by 3 µg/l (ppb), of rubidium by 3 µg/l (ppb), of vanadium by 1.2 µg/l (ppb), of tungsten by 0.015 µg/l (ppb), and of tellurium and hafnium by 0.003 µg/l (ppb).

Maximum dosage: 4 ml per 26 gallons (100 liters) daily.

 

Ingredients: Water, inorganic compounds of molybdenum, rubidium, vanadium, tungsten, tellurium, and hafnium.

 

What's Included?

Block Molybdenum (1000 ml)

More Information
SKU 256717
UPC 619106288924
Aquarium Type Saltwater
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Product Questions

Can I use this in a freshwater aquarium to help remineralize RO water (alont with other supplements to remineralize)? I find my plants are melting and I suspect it's due to lack to trace elements like molybdenum. I need a concentrates source to stabilize my tanks.
Question by: Soma Nikhanj on Nov 5, 2025, 10:03 AM
This is a product specific to seawater, so I would instead recommend a more freshwater focused product. Such as Remineraliz - Liquid Freshwater Mineral Supplement (500 mL) from Brightwell.
Answer by: Kristen Macdougall (BRS Staff) on Nov 5, 2025, 2:30 PM