TLDR Review: Kordon Methylene Blue 4 oz
Pros
- •Effectively treats fungal infections on fish eggs, koi, goldfish, and aquarium fish.
- •Works well for fin and tail rot as a separate bath treatment.
- •Safely helps with ammonia poisoning, nitrite poisoning, ich, velvet disease, and mild bacterial infections.
- •Proven track record of success and reliability according to multiple user experiences.
- •Can be used as a dip or in temporary containers for targeted treatment without harming fish.
- •Does not cause harm or health issues to aquatic animals when used correctly.
- •Useful to protect fish during shipping or fry rearing by preventing bacterial and fungal growth.
- •Noticeable improvement in fish behavior like swimming and eating after treatment.
- •Considered a safe alternative to malachite green, avoiding burning or extreme irritation.
- •Easy to use and supports healthy fry development and recovery.
Cons
- •Stains tank surfaces, including silicone seals, making it unsuitable for direct addition to main aquariums.
- •Should not be used directly in the main tank as it can harm beneficial bacteria essential for aquarium health.
- •Works best for mildly sick fish; not effective for severely ill or damaged fish.
- •Does not eliminate unpleasant fishy odors from aquariums.
Bottom Line
Kordon Methylene Blue is a trusted, go-to medicine for preventing fungal and bacterial infections in aquarium and pond fish, especially for targeted treatments like egg incubation, fin rot, and minor diseases. However, be prepared to isolate fish in a separate container since it stains tank silicone and can disrupt beneficial bacteria if used in the main aquarium. If you want a versatile, reliable treatment that’s safe for fish but requires careful application, this is a solid choice. For continuous aquarium treatment without staining concerns, you might want to look into alternative broad-spectrum aquarium medications.
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