Fritz FixIck clears ich (white spot disease) with a gentler approach. Instead of harsh formaldehyde or malachite green, it uses gentian violet, which gives it a signature purple color, plus antibacterial and antifungal action to help head off secondary infections. Safe for fresh and saltwater systems. Explore more fish medication.Features Treats ich (white spot) in freshwater and saltwater Uses gentian violet, with no harsh formaldehyde or malachite green Gentler on fish, gills, and organs than traditional ich meds Added antibacterial and antifungal action helps prevent secondary infections Simple quick-dose system, no reinfection after about one week when used as directed Choose Your Size 8 oz for smaller tanks 16 oz for larger tanks 1 gallon for bulk or store use How to Use Follow the label dosing for your tank volume and repeat as directed Remove activated carbon and ion-exchange resin during treatment Complete the full course to prevent reinfection Specifications Brand Fritz Type Ich treatment (gentian violet) Water Type Freshwater and saltwater Sizes 8 oz, 16 oz, 1 gallon Origin Made in USA Recommended Pairings Support the slime coat with ParaShield Rebuild the biofilter after treatment with FritzZyme Trace Browse all medication Frequently Asked QuestionsHow is it gentler?It uses gentian violet instead of formaldehyde or malachite green, which are hard on fish and the biofilter.Will it color the water?Gentian violet has a purple tint; follow the dosing and it works as directed.Fresh and saltwater?Yes, it is safe for both.