NT Labs Methylene Blue 100ml

NT Labs Methylene Blue

A trusted remedy for fungal, bacterial and parasitic infections

A classic aquarium treatment for bacterial, fungal and some external protozoan parasitic infections of fish, fry and eggs. Suitable for coldwater and tropical aquariums.

When your fish need help, Methylene Blue is one of the most trusted names in the hobby — and NT Labs' formulation brings that reliability to your tank. It tackles bacterial, fungal and certain external protozoan parasite infections, and it's gentle enough to be used safely with delicate eggs and fry, making it a go-to for breeders and everyday keepers alike.

When to reach for it
Use Methylene Blue when you spot the tell-tale signs of trouble: fluffy, cotton-wool-like fungal growths; a grey, velvety film or excess mucus over the body; or bacterial damage such as red open wounds, ulcers, missing scales, rotting fins and eroded mouth tissue. It's most effective in a quarantine tank or treatment bath, but can also be added to the main aquarium, used to protect fish during transport, or dabbed undiluted onto wounds with a cotton bud.

How to use it
Work out your tank volume, shake the bottle well, then mix the required dose into a litre of aquarium water and add it slowly — roughly 10ml treats 90 litres. For a quick dip, use 2ml per litre of fresh dechlorinated water and immerse the fish for no more than 10 seconds. A dose can be repeated four days later if needed.

Good to know
Methylene Blue can harm live plants and shrimp if overdosed and will affect the beneficial bacteria in your biofilter, so remove carbon during treatment, keep filtration running, and follow up with a 25% water change afterwards. It will also stain skin, silicone and ornaments — so handle with care.

Composition: Methylene Blue 2500mg/100ml. Available in 100ml.

When can I expect delivery?

• Gauteng (Jhb/Pta) - 1-3 working days
• Nationwide (Cpt/Dbn+) - 2-5 working days
• Outlying Areas - 3-7 working days

All orders are sent via Economy Road, typically through Fastway or Internet Express Couriers*. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.

If you prefer a faster 🚀 shipping option, we also offer The Courier Guy during checkout in the dropdown selection. Please note that this option is not free, and you must choose it to use it. Please pay careful attention to the cutoff times and delivery timeframe for these options during checkout.

Enjoy the convenience of collection points and lockers! 📦

No more waiting at home or at work for your delivery. Simply choose a collection locker or pickup point and collect your order when it suits you.

Delivery times to lockers and pickup locations typically range from 2–7 working days, depending on your location.*

Search a PUDO Location Near You

Collection timeframes:

• Bob Box: Collect within 2 days of receiving your collection notification.
• PUDO Lockers: Collect within 36 hours of receiving your collection PIN or SMS notification.
• Pargo Pickup Points: Collect within 5 days of arrival at the pickup location.

If a PUDO parcel is not collected within 36 hours, it will automatically be transferred to the nearest PUDO Kiosk or Depot at no additional cost. The parcel will then be held there for approximately 14 days before being returned.

Please ensure you collect your parcel within the applicable collection period. Uncollected parcels will be returned to the sender, and additional shipping charges may apply should the order need to be resent.