What do I need for an ich outbreak right now?

Four things matter most: a dependable heater that can hold 82-86 F / 28-30 C, an air pump with an airstone, a dechlorinator, and an anti-ich medication (formalin/malachite green types or a peroxide-based product). Vacuum and change 25% water every two days during treatment.

Do I need medication if I raise the temperature?

For light cases in hardy fish, heat alone to 82-86 F with strong aeration can clear ich because the parasite's cycle speeds up and falls off. Medication adds reliability and is worth it once spots are obvious across multiple fish, or if heat-sensitive species are present.

Is salt part of ich treatment?

Aquarium salt at 1-3 ppt (about 1 level tablespoon per 5 gallons for 1 ppt) supports osmoregulation and slime coat and mildly stresses the parasite. Skip salt entirely with shrimp, snails and scaleless fish, and never combine salt with medications unless the label explicitly approves.

Why remove carbon and UV during treatment?

Activated carbon strips medication from the water, and UV sterilizers degrade some compounds — both turn dosing into placebo. Remove carbon, turn off UV, and keep the biological media (that's where your bacteria live) running untouched.

The Ich Treatment Kit: Stock the Shelf Before the White Spots

Last updated: November 2026

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Ich moves fast: grains-of-salt on fins today, three dead fish next week if you spend days sourcing supplies between symptoms. The treatment toolkit is small and cheap, and the first-aid page for identification is here — confirm it's actually ich first, because costia and velvet don't play by these rules. What follows is the shelf inventory: what to own, what each item's numbers must hit, and the dosing rules that decide outcomes.

The kit at a glance

Item	Spec that matters	Role in treatment
Adjustable heater	Reliable hold at 82–86 °F / 28–30 °C; wattage per manufacturer gallon range	Speeds the ich life cycle so stages leave the fish together
Air pump + airstone	Enough for tank volume; warm water holds less oxygen	Non-negotiable during heat treatment — heat + meds both cut oxygen
Dechlorinator	Chloramine neutralizing	Every change during heavy water-change weeks
Anti-ich medication	Formalin/malachite-green type or peroxide-based, sized to your volume	Kills free-swimming stages heat exposes
Aquarium salt	Plain sodium chloride, no additives, anti-caking agents, or "medicated" salt	1–3 ppt support dosing where inverts can't die
Gravel vacuum	Any reliable siphon	Vacuuming every 2 days removes cysts and trophonts off the gravel
Thermometer	Digital probe	Heat protocols fail on guessing

Picks by budget

Core heat + air

Adjustable heater (with guard) + small dual-outlet air pump kit

This pair IS the treatment — medications help, but heat plus aeration clears light cases in hardy tanks. Buy the heater rated for one tank size larger so it's not pinned at maximum, and run the airstone at two bubbles-per-second strength during treatment.

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The medication

Formalin/malachite-green anti-protozoal (or peroxide-based alternative)

Standard for ich and also covers costia/velvet while you confirm diagnosis — buy the bottle that treats your volume at full label dose plus one re-dose cycle. Note: malachite-green products stain acrylic and are harsh on scaleless fish and plants; formalin-free peroxide products are gentler on planted tanks.

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Support chemicals

Plain aquarium salt + liquid dechlorinator

Salt must be additive-free — table salt with anti-caking and iodine is not fish salt. Dechlorinator sized so you never ration it during daily change weeks; under-conditioning water is its own problem.

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The dosing rules that decide whether you win

Remove carbon, switch off UV before the first dose — carbon strips medication, and without this step you're watching placebo work.
Calculate net water volume, not tank nominal size. Substrate and decor eat 10–15%; underdosing teaches the parasite nothing.
Heat slowly: +2 °F / 1 °C per hour to 82–86 °F / 28–30 °C (hardy species only; cold-water fish need in-tank alternative or split methods).
Re-dose per label schedule, typically every 2–3 days after a 25% change, until 3 days after the LAST visible spot — not the first clear day; hidden stages are in the gravel.
Vacuum gravel every 2 days and keep the 25% changes coming: cysts sit in the substrate and re-seed the water.
Stop feeding heavily: uneaten food + medication chemistry + reduced oxygen is the triple event that kills treated tanks.

Do not mix carelessly

Never combine medications with each other or with salt unless the labels approve the combo. Remove shrimp, snails and scaleless catfish from salt or formalin plans — and dose half-label for scaleless species where the product allows. Copper products do NOT stack with formalin treatments.

Aftercare (the part people skip)

Three days spot-free ≠ done: run one more full label cycle, then a 40% change, restart carbon media to pull residue, and run the filter normally. Feed lightly for a week — gills recovering from heat and meds take time. Test ammonia every other day for a fortnight: medication and heat both rock the biofilter, and post-treatment ammonia spikes are a classic second wave. Re-test before adding any new fish, and quarantine them 2–4 weeks anyway — ich reinfection through new arrivals is how tanks relapse.

FAQs

Can heat alone clear ich?

Light cases in hardy fish: yes, at 82–86 °F / 28–30 °C with heavy aeration and diligent vacuuming. Medication makes outcomes predictable once several fish show spots.

Do I treat the whole tank or one fish?

The whole tank. Free-swimming stages live in the water and gravel; a hospital tank that misses the cysts just relocates the outbreak.

How long does treatment take?

Typically 7–14 days of dosing plus three days past the last spot; the full parasite cycle can stretch past three weeks in cool water — that's why early stopping relapses.

What if treatment fails twice?

Stop and re-diagnose — repeated "ich" that won't respond is usually costia, velvet, or lymphocystis. The comparison table exists for exactly this moment.

Severe cases: consult an aquatic-experienced vet where available.