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Health and diseases

Ich in Bettas: White Spot Disease Recognised and Treated

Ich looks like grains of salt on the fins and body. What it is, how the life cycle decides treatment, and what to do first.

By Published 2 min read
How white spot presents, as a diagramSchematic flat-vector diagram of how white spot disease presents. It is a diagram, not a photograph of a real diagnosed fish, and it is not a diagnostic reference.Diagram

Ich is a parasite, and it is one of the few betta problems you can identify by looking. Distinct raised white dots the size of salt grains, scattered without pattern across the fins and body.

If the spots are flat, fuzzy, or in one patch, it is probably not ich. Read the diseases pillar for those.

Recognising it

Feature Ich Not ich
Shape Raised, distinct, round Flat patch, or cottony tuft
Size Roughly a grain of salt Larger irregular growths
Distribution Scattered, fins and body One localised area
Early behaviour Flicking and rubbing on objects Varies

The rubbing usually comes first. A fish darting at the substrate or scraping against wood a few days before spots appear is the classic sequence.

Why the life cycle decides everything

The parasite has stages. Embedded under the skin it is protected, and no medication in the water reaches it. It then leaves the fish, forms a cyst, and the cyst releases many free-swimming young.

Only that free-swimming stage is vulnerable.

Two consequences follow, and they are the whole of ich treatment.

Treatment must run long enough for every embedded parasite to emerge. The spots disappearing means the visible stage has left the fish, not that the infection has gone, so stopping there guarantees a return.

The tank is infected, not just the fish. Moving the betta to a clean container and treating it alone leaves a tank full of cysts waiting.

What to do

  1. Test the water. Ammonia and nitrite at zero. An outbreak usually follows a stressor, and bad water is the most common one.
  2. Remove activated carbon from the filter. Carbon adsorbs medication and will quietly reduce your dose to nothing.
  3. Raise the temperature gradually toward the upper end of the betta range. This speeds the life cycle so parasites reach the treatable stage sooner. Raise it slowly, over hours rather than minutes, and keep an eye on the fish.
  4. Treat with a product intended for white spot, at the dose on the label. Do not improvise, do not combine products, and do not scale a dose by guesswork.
  5. Continue for several days after the last spot has gone, as the label directs.
  6. Vacuum the substrate during changes to remove cysts.
  7. Keep the fish fed and leave the light low.

If the fish deteriorates, if the gills are affected and it is struggling to breathe, or if the treatment produces no change over its full course, contact an aquatic veterinarian. We do not publish dosages here for the same reason we do not publish diagnoses: getting either wrong in five gallons of water is dangerous.

Preventing the next one

Quarantine every new fish for a fortnight in a separate cycled tank. Never add shop water to your display tank; net the fish across instead. Keep the temperature steady, because chilling is what turns a low-level presence into an outbreak.

Where to go next

The diseases pillar covers what the other white, fuzzy and patchy presentations are, and the quarantine guide covers how to set up the tank that prevents this.

Key takeaways

  • Distinct raised white dots the size of salt grains, scattered across fins and body.
  • The parasite is only vulnerable in its free-swimming stage, which is why treatment must continue past the point where the spots vanish.
  • Raising temperature speeds the life cycle. It does not on its own cure the infection.
  • Treat the whole tank. The parasite is in the water and substrate, not only on the fish.
  • Follow the medication label exactly and never combine treatments without advice.

Frequently asked questions

What does ich look like on a betta?
Small raised white dots, often compared to grains of salt or sugar, scattered irregularly across the fins, body and sometimes the gills. The fish typically flicks or rubs against objects before the spots become visible.
How long does it take to treat ich?
Usually one to two weeks, and the duration depends on temperature because the parasite life cycle runs faster in warmer water. Continue treatment for several days after the last visible spot has gone, since the stage that remains is the one you cannot see.
Can I treat ich with heat alone?
Raising the temperature accelerates the life cycle so the parasite reaches its vulnerable free-swimming stage sooner, which is why heat is used alongside treatment. On its own, heat is not reliable, and pushing a betta tank far above its normal range carries its own risks. Combine it with an appropriate medication.
Do I need to treat the whole tank?
Yes. The free-swimming stage and the cysts that release it are in the water column and substrate, so treating the fish in isolation leaves the tank able to reinfect it. Remove carbon from the filter first, because carbon adsorbs medication.
Where did the ich come from?
Almost always a new fish, plant or a volume of shop water added without quarantine. The parasite is frequently present at low levels and becomes a visible outbreak when a fish is stressed or chilled.
What dose of medication should I use?
Follow the dose printed on the product you have bought, and nothing else. Doses vary between formulations and between countries, and an incorrect dose in a small tank is dangerous. For a serious or unresponsive case, contact an aquatic veterinarian.

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