--- product_id: 52326693 title: "Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces" brand: "kordon" price: "VT8784" currency: VUV in_stock: true reviews_count: 13 category: "Kordon" url: https://www.desertcart.vu/products/52326693-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater-aquariums store_origin: VU region: Vanuatu --- # Safe for fresh & saltwater use 4oz potent liquid formula Targets fungal & protozoan infections Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces **Brand:** kordon **Price:** VT8784 **Availability:** βœ… In Stock ## Summary > 🐠 Elevate your aquarium careβ€”because your fish deserve the best defense! ## Quick Answers - **What is this?** 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?** VT8784 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/52326693-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater-aquariums) ## 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 - β€’ **Egg & Fry Guardian:** Safe for delicate fish eggs and fry, promoting successful breeding without fungal setbacks. - β€’ **Fungal Defense Mastery:** Clinically proven to prevent and treat superficial fungal infections, keeping your aquatic ecosystem pristine. - β€’ **Stress Reduction Formula:** Supports fish health by reducing stress during treatment, enhancing recovery and vitality. - β€’ **Protozoan Parasite Shield:** Effectively combats ich, chilodonella, and costia, ensuring your fish stay vibrant and healthy. - β€’ **Versatile & Safe Alternative:** A trusted substitute for malachite green, ideal for sensitive species and all aquarium types. ## Overview Kordon Methylene Blue is a 4-ounce liquid treatment designed to prevent and treat fungal infections and external protozoan parasites in both freshwater and saltwater aquariums. Safe for fish eggs and fry, it reduces fish stress and serves as a reliable alternative to malachite green, ensuring comprehensive aquatic health management. ## 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 | | Best Sellers Rank | 50,540 in Pet Supplies ( See Top 100 in Pet Supplies ) 561 in Aquarium Water Treatments | | Brand Name | Kordon | | Country Of Origin | USA | | Customer Reviews | 4.7 4.7 out of 5 stars (3,608) | | Global Trade Identification Number | 00048054373442 | | Included Components | BOTTLE, CAP | | Item Form | Liquid | | Item Type Name | KORDON # 37344 METHYLENE BLUE 4 OZ. | | Item Weight | 4 Ounces | | Liquid Volume | 4 Fluid Ounces | | Manufacturer | KORDON LLC | | Manufacturer Part Number | 048054373442 | | Model Number | MODEL-37344 | | Pet Type | Fish | | Target Species | Fish | | UPC | 048054373442 | | Unit Count | 118.0 millilitre | ## Product Details - **Brand:** Kordon - **Item form:** Liquid - **Item weight:** 4 Ounces - **Liquid volume:** 4 Fluid Ounces - **Manufacturer:** KORDON LLC ## Images ![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 ## Frequently Bought Together - Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces - Kanaplex, 5 g(0.18 oz) - API AQUARIUM SALT Freshwater Aquarium Salt 36-Ounce Box --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/52326693-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater-aquariums](https://www.desertcart.vu/products/52326693-methylene-blue-disease-preventative-safe-for-freshwater-and-saltwater-aquariums) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-09*