Description
Methylene Blue Lab Grade Powder — A Classic, Trusted Aquarium Treatment
Methylene blue has been a staple in fish keeping for decades, and for good reason. This lab grade powder is a reliable treatment used by hobbyists and breeders to help deal with common external problems such as fungal infections, and to protect fish eggs from fungus during hatching.
It is also commonly used in quarantine and hospital tanks, for short dips when bringing in new fish, and by breeders who want to keep egg batches clean and healthy. Many keepers consider it an essential item in their fish first-aid kit.
Because it is a concentrated lab grade powder, only a small amount is needed, so a 5g pack lasts a long time. Dissolve it in water before use and measure carefully according to the instructions on the pack.
Methylene blue can affect beneficial filter bacteria and live plants, and it will stain silicone, decor and skin, so it is best used in a separate hospital or quarantine tank. Always follow the dosage on the pack. Remove activated carbon from the filter during treatment, as it absorbs medicine.
Product at a glance:
- Form: Lab grade powder
- Pack size: 5g
- Commonly used for: Fungal and external infections, egg protection, quarantine
- Best used in: Separate hospital, quarantine or breeding tank
- Not suitable for: Main display tanks with live plants or an established biofilter
- Dosage: Follow the instructions on the pack — do not overdose
- Safety: Keep out of reach of children; avoid skin and eye contact; wash hands after use
- Storage: Cool, dry place away from direct sunlight, tightly closed
Trusted, effective and long-lasting — lab grade methylene blue is a must-have for every fish keeper’s first-aid kit.

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