Tropic Marin


Grouped product items
50 mL Elimi-NP

SKU: 212881

In stock

$6.96 $8.19

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250 mL Elimi-NP

SKU: 253018

In stock

$18.60 $18.60

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Liquid Carbon Dosing Concentrate for Nutrient Reduction in Reef Aquariums

  • Efficient reduction of nitrate and phosphate
  • Increased skimmer efficiency
  • Bacterial biomass acts as nutrient source for filter feeders
  • Suitable for marine fish, soft corals, LPS, SPS, and other inverts
  • Easy-to-dose liquid solution


For the general health and well-being of your reef inhabitants, it's beneficial to maintain nitrate and phosphate at very low concentrations. This encourages better coral calcification while also discouraging excess algae growth. Organisms such as bacteria will consume nitrate and phosphate in a balanced ratio along with organic carbon, but oftentimes the system can become carbon limited and prevent efficient export of the other two. Elimi-NP can help to restore this balance by supplying a controlled source of carbon to the aquarium. This allows nitrate and phosphate consuming bacteria to resume their normal activity and help to export wastes through removal of their biomass.

Elimi-NP is ideally suited to saltwater aquariums where the ratio of nitrate to phosphate is 10:1 or lower, as this will work well with the carbon concentration Elimi-NP provides. For systems where the ratio of nitrate to phosphate is higher, we suggest the use of NP-Bacto-Balance instead, as this has additional additives to achieve a better balance between nitrate, phosphate, and carbon. 


Dosage Recommendations

  • Begin with a daily dose of 0.1 ml per 100 l (26 US-gal) of aquarium system volume.
  • Adjust the dosage after 2 weeks after testing the nitrate and phosphate concentrations and observing reactions of animals. 
  • Dosage can be increased by 0.1 ml per 100 l (26 US-gal) of aquarium system volume.
  • Dose Elimi-NP into the flow of the pump to ensure proper distribution throughout the aquarium.
  • Store the bottle tightly sealed!


Maximum dose: A daily dose of 0.5 ml per 100 l (26 US-gal) of aquarium system volume should not be exceeded. The concentration of phosphate in the reef aquarium should only be lowered slowly to avoid possible adjustment stress in the organisms. At the same time, the nitrate-phosphate ratio should not exceed 10:1.

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Product Questions

Can this product be used with a dosing pump, or will it destroy the tubing?
Question by: John Brady on Aug 4, 2022, 3:05 PM
According to Tropic Marin, this can be used with a doser with no issues to the pump or tubing.
Answer by: Scott F. (BRS Staff) on Aug 5, 2022, 12:13 PM
Hi, my po4 is 0.08 per Hanna test and nitrate is barely visible tint in color for nyos test. I have some hair algae and some bryopsis present in the tank. Only export is chemi- pure blue. Is this ElIMI-NP the correct product to use to reduce po4 while not bottoming out nitrates?

Question by: Bill on Sep 2, 2020, 3:04 PM
Hey there-

Thank you for reaching out to us! Elimi NP is used primarily for systems where the phosphate levels are greater than 0.1ppm, for your situation we would actually recommend the regular NP-Bacto Balance which is meant for ranges between 0.04 ppm - 0.1 ppm.

Happy reefing! c:
Answer by: Brad Ohmann on Sep 2, 2020, 3:46 PM