top of page
27202 Nitribiotic - 25ml.png

Probiotic and nitrifying bacteria for saltwater and freshwater aquariums




Product description

Tropic Marin® Nitribiotic is a combination of probiotic and nitrifying bacteria in one preparation which activate the immune systems of fish and shrimp and improves the water quality. The nitrifying bacteria efficiently start the nitrification process, i.e. the process of breaking toxic ammonia down into non-toxic nitrate. The purple bacteria contained in Tropic Marin® Nitribiotic oxidises toxic hydrogen sulphide to non-toxic sulphur and sulphate. Probiotic bacteria and yeasts have a proven positive effect on the health and well-being of fish and shrimp, especially when breeding.



  • Bacterial compound with probiotic, nitrifying and purple bacteria

  • The addition of probiotic bacteria has a healthy effect and improves the stress resistance in the animals

  • Nitrifying bacteria assist the nitrification

  • Purple bacteria break down hydrogen sulphide

  • Suitable for any aquarium stock – fish, corals, LPS, SPS, other filter feeders and/or crustaceans

  • Easy-to-dose liquid solution

  • Long shelf life even after opening

  • Odorless



Bacillus subtilis, Nitrobacteria, Saccharomyces, Lactobacillus, Purple bacteria.


Application & Dosage

Shake the bottle well before each use! To enable the bacteria to develop unimpeded in the aquarium, turn off UV systems, ozonisers and skimmers before dosing and only turn on again 3-4 hours after dosing. Tropic Marin® Nitribiotic can be dosed into the inlet of a biological filter or directly into the aquarium water.

Attach the enclosed hose to the syringe and measure the desired amount of Tropic Marin® Nitribiotic with the syringe. The air that gets into the hose and syringe while pulling the syringe, does not affect the dosage. The bottom edge of the plunger always displays the correct dosing amount even if the desired quantity of Tropic Marin® Nitribiotic, due to the air drawn in, is only in the hose and not in the syringe chamber. The air drawn in serves to empty the hose during dosing.

Begin with a dose of 1 ml for every 100 l (26 US-gal) of aquarium system volume. A subsequent weekly dosing of 1 ml per 200 l (52 US-gal) of aquarium system volume maintains and renews the probiotic effect.

Maximum dose: Up to a double dose of Tropic Marin® Nitribiotic is still safe for the aquarium.

Dosing calculator


Other product recommendations

Decreasing ammonia and nitrite concentrations in the aquarium is a sign of the onset of nitrification. The recommended nitrite and ammonium concentrations in the reef aquarium should each be <_ 0.05 mg/l. To check the nitrification and the nutrient concentrations, we recommend the Tropic Marin® Compact Lab. Along with the Tropic Marin® NO2 / NO3 -Test and Tropic Marin® NH4+ / NH3 -Test, the set also includes a Tropic Marin® PO4 -Test, Tropic Marin® KH-Test and Tropic Marin® pH-Test for saltwater aquaria.

Tropic Marin® offers more products for controlling the nutrient concentrations and for supplying microplankton. Ask your aquarium retailer for an effective bio-reactor (such as the Tropic Marin® Bio-Actif Reactor 5000), suitable filter materials (e.g. Tropic Marin® NP-Bacto-Tricks) and water additives of Tropic Marin®.


Frequently asked questions

Answers to frequently asked questions about this product can be found in our FAQ section.


Container sizes

25 ml / 0.85 fl.oz.                 Art. Nr. 27202                                                  50 ml / 1.7 fl.oz.                   Art. Nr. 27204

bottom of page