Formulation evidence record
Seachem SulfaPlex
Bacterial and fungal infection treatment · US formulation
Shrimp
Amano, cherry, crystal and other freshwater shrimp.
Snails
Nerite, mystery, ramshorn and other aquarium snails.
Live plants
Rooted and floating live aquarium plants.
Not addressed by the manufacturer for: scaleless fish, marine invertebrates, biological filter. No statement was found, so no verdict is given — that is not a clearance.
Why FishyMag says this
The manufacturer's own wording, quoted rather than paraphrased, so you can judge it yourself.
Shrimp
Manufacturer advises againstThe directions instruct removing all invertebrates. Note this is the same sentence Seachem prints across its medication line rather than a finding specific to sulfathiazole — the instruction still stands, but it is blanket guidance, not a test result for this chemistry.
Contains sulfathiazole, with a source-linked caution associated with this group. This raises a flag—it is not the basis of the verdict above.
“Remove all invertebrates - these are extremely sensitive to medication.”
manufacturer page · seachem.com · checked August 16, 2026
Snails
Manufacturer advises againstCovered by the same blanket instruction to remove all invertebrates.
Contains sulfathiazole, with a source-linked caution associated with this group. This raises a flag—it is not the basis of the verdict above.
“Remove all invertebrates - these are extremely sensitive to medication.”
manufacturer page · seachem.com · checked August 16, 2026
Live plants
No evidence foundSeachem does not address live plants for this product.
No manufacturer statement was found for this group. That is not the same as a clearance — treat it as unconfirmed and ask the manufacturer before dosing.
Product details
- Manufacturer states it treats
- Bacterial infections, Fungal infections, External and internal infections
- Chemical filtration
- Remove chemical filtration during treatment
- Ingredients as stated
- Sulfathiazole (69%).
- Active ingredients
- Sulfathiazole
manufacturer page · seachem.com · checked August 16, 2026
Record last checked August 16, 2026 · confidence medium
Check against your tank
Change what is in your tank to see how the answer moves.
Bacterial and fungal infection treatment · US formulation
The manufacturer advises against using this with your tank.
At least one thing you listed is named in a warning. Move that livestock to another tank, or choose a different treatment.
This answers for the assumed selection above, not a tank you have described. Adjust it if it is not yours.
- ShrimpManufacturer advises against
The directions instruct removing all invertebrates. Note this is the same sentence Seachem prints across its medication line rather than a finding specific to sulfathiazole — the instruction still stands, but it is blanket guidance, not a test result for this chemistry.
- SnailsManufacturer advises against
Covered by the same blanket instruction to remove all invertebrates.
- Live plantsNo evidence found
Seachem does not address live plants for this product.
See the manufacturer’s exact wording and sources for Seachem SulfaPlex →
No evidence found means no manufacturer statement was found — not that the product is safe. FishyMag does not diagnose disease or recommend treatments.
Other treatments
Next steps
FishyMag reports what manufacturers say, quoted and linked. It does not diagnose illness or recommend a treatment, and it never infers that a product is safe from the absence of a warning — where no statement exists, it says so.
Formulations change. Always read the label on the bottle in your hand, and contact the manufacturer if your tank contains anything valuable or unusual.