Aquasonic Formalin Malachite Solution

Aquasonic Formalin / Malachite 250ml is a copper-free, fish-only treatment designed to combat whitespot (Ich), fungus, and a range of external parasites affecting the skin and gills of freshwater fish.

This dual-action formula also targets cloudy or slimy skin diseases, making it ideal for freshwater aquariums needing reliable parasite control.

Safe for freshwater, fish-only tanks. Do not use in tanks with shrimp, snails, or other invertebrates.

Features & Benefits

• Dual-Ingredient Formula - Combines Formalin and Malachite Green for a broad-spectrum treatment effective against common freshwater fish infections.
• Effective Against Multiple Conditions - Treats whitespot, skin/gill ectoparasites, fungal growths, slimy skin, and cloudy patches.
• Copper-Free & Fast-Acting - Safe for use in copper-sensitive systems (though not suitable for invertebrates) and delivers quick relief when applied correctly.
• Trusted Australian Brand - Manufactured by Aquasonic, a respected name in aquarium health products.

When to Use

• Fish show symptoms of whitespot (Ich)
• External parasites present on skin or gills
• Fungal infections or slimy skin disease
• Suitable for fish-only freshwater aquariums

How to Use

Step 1 – Preparation: Remove all invertebrates before treatment. Turn off UV filters and take out activated carbon.

Step 2 – Dosage: Dose 5mL per 20 litres of aquarium water once daily for 4 days.

Step 3 – Temperature Boost: Raise water temperature by 2–3°C (within safe range for fish species) to increase treatment effectiveness, particularly for whitespot.

Step 4 – Aftercare: After Day 4, perform a partial water change and resume normal filtration.

Frequently Asked Questions (FAQ)

Can I use this in a community tank?
Only if the tank is fish-only. Do not use if invertebrates are present.

Will this harm my filter bacteria?
No, but it's advised to remove carbon filtration during treatment to maintain effectiveness.

Can I repeat the treatment?
Yes, if symptoms persist, you may repeat the treatment after a short rest period and a partial water change.