Seachem Sulfaplex 10gm/0.4oz
Sulfathiazole is an effective and safe treatment for many bacterial, fungal and protozoan infestations in the aquarium. Usual dose is 250 mg per 40 L (10 gallons), but dose may be increased up to four-fold. Easily removed with carbon and does not impair nitrification. Contains sulfathiazole
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Product Specifications
| Component | Value |
|---|---|
| Active Ingredient | Sulfathiazole |
| Weight | 10 gm / 0.4 oz |
| Usage | For bacterial, fungal, and protozoan infestations in aquariums |
| Removal Method | Carbon filtration |
| Effect on Nitrification | Does not impair nitrification |
FAQ
What is the recommended dosage for Seachem Sulfaplex?
The usual dosage is 250 mg per 40 L (10 gallons). The dose can be increased up to four-fold depending on the severity of the infestation.
Does Sulfaplex affect the nitrogen cycle in the aquarium?
No, Sulfaplex does not impair nitrification and is safe to use in established aquarium systems.
Can Sulfaplex be removed from the water after treatment?
Yes, it can be easily removed using activated carbon filtration.

Evan Peake –
Used Sulfaplex to treat a fungal outbreak in my freshwater tank. The treatment worked quickly and didn’t harm my fish or the beneficial bacteria. I followed the dosage instructions carefully and saw improvement within a few days. Easy to use and effective.
Blake Mills –
Tried it for a bacterial infection in my shrimp tank. It cleared the issue without affecting the water chemistry. The product is well-packaged and the instructions are clear. Would recommend for small-scale aquariums.
Jacob Marshall –
Felt confident using Sulfaplex after reading the safety notes. It worked well on a protozoan infestation. No side effects on the filter bacteria. The dosage was easy to calculate and the treatment lasted the full cycle.