Tonic salt
API
Fish & Aquatic · Water Care
API
API Aquarium Salt, 67 oz
Tonic salt
Best for: Freshwater tonic and some treatments
Evaporated sea salt with no additives, used as a tonic and to support gill function in freshwater fish when your vet or a treatment calls for it.
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What we like
- No additives
- Large container
- Versatile
Keep in mind
- Not tolerated by some fish and plants
- Doesn't evaporate — only water changes remove it
Our in-depth look
Who it's for
Livebearers, goldfish and short-term treatment situations.
Who should skip it
Scaleless fish (corydoras, many catfish and loaches), and most live plants — they're sensitive.
Tips
Add salt only when needed, not routinely. Replace only the amount removed in water changes.
Questions owners ask
Does salt evaporate?
No, only water changes remove it.
Is salt safe for corydoras?
They're sensitive; avoid or use with caution.
