SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/fish-ammonia-stop-feeding

Your tank test shows ammonia. What is the first thing to do, per UF/IFAS?

Cut back or stop feeding, since leftover food makes ammonia worse.

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  1. Feed extra so the fish stay strong
  2. Reduce or stop feeding ✔
  3. Add more fish to use it up

Why: UF/IFAS says the first step is to reduce or stop feeding, because uneaten food only makes it worse. Overfeeding is a major cause of high ammonia.

Huh, didn't know that: UF/IFAS says a 25% to 50% water change also helps remove ammonia, if the new water has none.

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References

Answer: Reduce or stop feeding. UF/IFAS says the first step is to reduce or stop feeding, because uneaten food only makes it worse. Overfeeding is a major cause of high ammonia.

  1. UF/IFAS EDIS FA031: Ammonia in Aquatic Systems ask.ifas.ufl.edu/publication/FA031
    The first thing to do when ammonia is present in a pond or tank is to reduce or stop feeding.
    Checked 2026-10-11.
  2. UF/IFAS EDIS FA031: Ammonia in Aquatic Systems ask.ifas.ufl.edu/publication/FA031
    Overfeeding is a major cause of high ammonia concentrations
    Checked 2026-10-11.
  3. UF/IFAS EDIS FA031: Ammonia in Aquatic Systems ask.ifas.ufl.edu/publication/FA031
    A 25% to 50% water change will help remove some ammonia
    Checked 2026-10-11.

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