About Us
Astaxanthin Powder
Filtration Basics
Fin Rot or Not?
Water Parameters
Best Livebearer Diet
Medications Index
Acriflavine Neutral
Anti-Parasite Quad
Chloroquine Phosphate
Doxycycline Hyclate
General Antibiotic Cure
General Parasite Cure
General Trio
Kanamycin Sulfate
Malachite Green
Metronidazole Powder
Methylene Blue
Neomycin Sulfate
Nitrofuracin Green
Oxolinic Acid
Oxytetracycline Hydrochloride
TMP Sulfa

Malachite Green

Malachite Green is a chemical dye with antimicrobial properties to help fight disease.  It has many uses from treating external parasites, such as ich, in both freshwater and saltwater environments as well as treating certain fungal diseases.

Treats:  Egg fungus, ich and other common external parasites, oodinium (Velvet), Saprolegnia


Bath: Add 1-2 mg per liter for a 10 minute bath; or 0.5 mg/l for up to an hour. Monitor fish closely and do not exceed the time limit for the strength of bath.

External Parasites: Mix with formalin to create your own treatment. Mixing 3.68 grams per liter of pure formalin to create a solution. Then dose at 5 drops per gallon. Many liquid ich products commonly found in local stores is based on this formula.

Stock Solution: Add 3.5 grams per liter distilled or RO/DI water. Dosed at 1 drop per gallon. Repeat every other day for a max of 3 doses. Before each dose do a 25% or greater water change.

Use caution when dosing as this chemical dye can cause gill issues when overdosed.

Malachite Green can stain seals and tank glass. Use caution when treating a display tank.