Posted by @Chris_Lewis · 14h ago
Ich is the disease almost every keeper meets eventually. Caught early, it's very treatable.
Identify it. Tiny white spots like grains of salt on fins and body, fish "flashing" (scratching against decor), clamped fins, and faster breathing. It usually flares after a stressor — a temperature drop, shipping, or a new unquarantined fish.
Why timing matters. The parasite is only vulnerable to treatment during its free-swimming stage; while it's embedded in the fish (the white spot) it's shielded. Warmth speeds its lifecycle, which is why heat is part of the plan.
A safe treatment plan. Raise the temperature gradually to about 82–86°F to push the parasite through its cycle faster (make sure your fish tolerate it and keep oxygenation up — warm water holds less). Treat the whole tank, since the parasite is in the water and substrate, not just on the spotted fish. Use aquarium salt or a dedicated ich medication, and keep treating for several days after the last spot disappears to catch the free-swimming generation. Caution: scaleless fish (loaches, many catfish) and some species are sensitive to salt and certain meds — dose at half strength and check the species database page for sensitivities first.
Prevent the next outbreak: quarantine new arrivals for two weeks, keep temperature stable, and reduce stress.
Your turn: post what you're seeing (a photo helps) and your tank's temperature and stock — we'll help you confirm it's ich and pick a treatment that's safe for your specific fish.