Check the listing for details. Fritz Aquatics Expel-F Fungal Treatment. Condition: New. Listed at 12.99 USD. Fritz Expel-F is safe and effective anti-fungal medication for treating infections such as Ichthyophonus hoferi and Saprolegnia, as well as certain other true fungal infections. Fungal infections are generally characterized by white, patchy, cotton-like growths on the body, mouth, or fins. Fungal infections usually occur as secondary infections from a previous wound or injury. Without treatment, fungal infections will spread and ultimately cause death. Fritz Expel-F will negatively affect Bryopsis algae growth.Can be used full strength with scaleless fishNo contraindications: can be used with all of our other products and medsSafe for invertebrates including: corals, snails, shrimp, clams, other crustaceans and molluscsDirections & DosageUse one packet of Expel-F per 10 gallons (38 L) in a small container or glass, mix, and add to a high flow area in sump. Powder will dissolve in system over time. Treatment only requires one dose of medication. Treatment period is 14 days.