---
product_id: 52326693
title: "Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces"
brand: "kordon"
price: "€ 33.74"
currency: EUR
in_stock: true
reviews_count: 13
category: "Kordon"
url: https://www.desertcart.it/products/52326693-kordon-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater
store_origin: IT
region: Italy
---

# Safe for eggs, fry & all fish types 4oz potent liquid formula Fights fungal & protozoan infections Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces

**Brand:** kordon
**Price:** € 33.74
**Availability:** ✅ In Stock

## Summary

> 🐠 Keep your aquarium thriving with the ultimate fungal & parasite defense!

## Quick Answers

- **What is this?** Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces by kordon
- **How much does it cost?** € 33.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/52326693-kordon-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater)

## Best For

- kordon enthusiasts

## Why This Product

- Trusted kordon brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Egg & Fry Guardian:** Safe for delicate fish eggs and fry, promoting healthy breeding without harmful side effects.
- • **Fungal Defense Mastery:** Clinically proven to prevent and treat superficial fungal infections, keeping your aquatic ecosystem pristine.
- • **Stress Reduction Formula:** Reduces fish stress by improving oxygen transport, enhancing overall aquatic vitality.
- • **Protozoan Parasite Shield:** Effectively combats ich, chilodonella, and costia, ensuring your fish stay parasite-free and thriving.
- • **Malachite Green Alternative:** A safer, odor-free substitute for malachite green, perfect for sensitive species and eco-conscious aquarists.

## Overview

Kordon Methylene Blue is a 4-ounce liquid treatment designed for freshwater and saltwater aquariums. It prevents and treats superficial fungal infections and some external protozoan parasites like ich, while being safe for fish eggs and fry. This odor-free, USA-made formula also helps reduce fish stress by aiding oxygen transport, making it a trusted alternative to malachite green for sensitive species.

## Description

Product Description Methylene blue is effective against superficial fungal infections of fishes. The drug may be used as an alternative to malachite green for the control of fungus when it is known that the fish to be treated are sensitive. Methylene blue is safe for use with fish eggs and fry for the prevention of fungal infections. As a secondary use, it is effective against some external protozoans, such as ich, chilodonella and costia. Ingredients Methylene Blue is stable indefinitely in the 2.303% solution P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Directions [GENERAL INSTRUCTIONS: Dilute and add the product to the aquarium water. Specific steps or dosage amounts are not provided in the given product information.] See more

Review: Good product - Works well great stuff
Review: Medicine staple for fish keepers - This product works really well. As someone who breeds fish and also keeps Axolotls I have used this multiple times and has always done its job. Used it for preventing fungus on eggs as well as treating fungus on Axolotls gills

## Features

- Kordon methylene blue 4oz
- Methylene blue is effective against superficial fungal infections of fishes
- The drug may be used as an alternative to malachite green for the control of fungus

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00025646W |
| Allergen Information | Odor-Free |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 32,450 in Pet Supplies ( See Top 100 in Pet Supplies ) 378 in Aquarium Water Treatments |
| Breed Recommendation | All Breed Sizes |
| Care Instructions | Store in a cool, dry place. Do not freeze. |
| Closure | CAP |
| Colour | CLEAR BLUE |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,539) |
| Date First Available | 16 Aug. 2010 |
| Flavor | Other |
| Item Form | Liquid |
| Item Weight | 9.07 g |
| Item model number | MODEL-37344 |
| Number of Items | 1 |
| Pet Life Stage | All Life Stages |
| Product Dimensions | 5.08 x 5.08 x 12.7 cm; 9.07 g |
| Quantity | 1 |
| Size | 118 ml (Pack of 1) |
| Special features | MADE IN USA |
| Specific Uses | The use of Methylene Blue is primarily for the control of fungus on eggs, and to assist the transport of oxygen in fish poisoned by cyanide and nitrite ion. Secondary uses are for the control of some external protozoan parasites of fishes. Methylene Blue is an alternative for treatment with other medications when prevailing factors preclude the use of another medication. |
| Storage Information | STORE IN COOL DRY PLACE. NO SUN EXPOSURE |

## Product Details

- **Brand:** Kordon
- **Item form:** Liquid
- **Item weight:** 0.02 Pounds
- **Liquid volume:** 4 Fluid Ounces
- **Manufacturer:** KORDON LLC

## Images

![Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces - Image 1](https://m.media-amazon.com/images/I/61Ueqt3BcYL.jpg)

## Questions & Answers

**Q: Has anyone used this for fin rot and does it work well?**
A: Use a few drops of this with a tsp of Epson salt per gallon and your fishy will heal. The methylene blue will stick to wound to provide oxygen to promote healing. Change 1/3 of the water per week.

**Q: Is this solution good for microscope labs?**
A: heck yeah!

**Q: Can someone tell me if there are any additional ingredients ( preservatives,food colorings,additives,etc.) in this product?**
A: label does not list any addl ingredients. Does state for aquarium fish use only. Not for human or food fish use.

**Q: How much do you use per gal?**
A: Please aquarium use, please follow the directions on the bottle, which says 1 tsp in 10 gallons produces a 3ppm solution. For 1 gallon, one tenth of a teaspoon is 0.5 mL, or about 10 drops. For other uses, please be aware that this is not a 1% solution. The manufacturer states that this is a 2.303% solution. This means that each drop contains 1.15mg (not 0.5mg).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product
*by S***0 on 1 November 2025*

Works well great stuff

### ⭐⭐⭐⭐⭐ Medicine staple for fish keepers
*by S***Y on 9 September 2025*

This product works really well. As someone who breeds fish and also keeps Axolotls I have used this multiple times and has always done its job. Used it for preventing fungus on eggs as well as treating fungus on Axolotls gills

### ⭐⭐⭐⭐⭐ Perfect
*by E***D on 6 September 2025*

Great product

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-23*