Malachite Green

Disinfecting agent;

Against skin parasites. Suitable for removal of mould.

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Product Description


1ml per 100 l water.


We strongly recommend to increase water temperature by about 2°C. Do not filter, turn the light off and increase air circulation.
Then exchange half of the water in the aquarium, clean the filter and apply START+ a BIOFILTR.



Volume / Weight Packing EAN
ml g oz ks
20  20  0,68  25  8594000251859
 100  100  3,38  10  8594000250500
 250  250  8,45  5  8594000251422
 500  500  16,91 3  8594000251439
 1000  1000  33,81  3  8594000250685
 5000  5000  169,07  1  8594000252184


Additional Information


This agent is highly effective especially against skin parasites, Ichthyophthirius multifiliis (“white-spot disease”, up to o 1 mm), Oodinium, predacious infusorians, bacteria and algae. It is used extensively by aquarists and in fishery in general. The agent is very strong, therefore it is recommended to use it with utmost caution.

Be sure to observe the dosage specified in the instructions. If the above-mentioned instructions are observed, the percentage of successful treatments is very high, with the exception of fish with infected gills (fish linger with their heads pointing towards the surface and they breathe with difficulties). In such cases it is recommended to use methylethylene blue.


The initial dose is 1 ml per 100 litres of aquarium water, following a change of 1/2 of the aquarium water volume with fresh water.

Note: Malachite green quickly binds onto organic matter. Therefore, if the aquarium is overgrown with plants, we may add a very small dose a few hours later, while monitoring the behaviour of the fish. In case of accidental overdose, immediately add fresh water.


On the 1st, 3rd and 6th day, following a previous change of 1/2 of water volume, apply a full dose. (1 ml per 100 litres of aquarium water at the most.)

On the 9th day, it is possible to add another half-dose or a half-dose of FMC, without changing the water.

In course of time, parasite strains have acquired a certain immunity against this kind of chemicals, therefore it is necessary not to interrupt the treatment and always to finish it fully!

When working with malachite green, always disconnect filtration, increase temperature, turn the light off and do not feed the fish!

In soft and acidic aquarium water, the effect of the agent is increased!

Once the infection is successfully healed, it is recommended to apply appropriate doses of “BIOFILTR” and “START+” in order to restore the denitrifying bacteria in the filtration media and to restore biological balance in the aquarium.


The product may stain clothes!

The agent is sold in a special container which prevents photodecomposition. However, store the product in a cool dark place and always out of the reach of children!

Observe basic hygienic rules when using this product. Do not eat, drink or smoke. When the agent comes into contact with mucous membranes, seek medical advice.

The product may stain clothes!


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