Fungal infections are a common challenge for aquarium hobbyists. This guide highlights effective, widely available fish remedies from API designed to treat fungal infections and support overall fish health. Each product is selected for clarity on use, scope, and safety for freshwater and saltwater fish alike. Read on to compare options and pick a treatment that’s right for your tank.
| Product | Brand | Form | Key Use |
|---|---|---|---|
| API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy 16-Ounce Bottle | API | Bottle | Fungal infections on body and fins |
| API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy 8-Ounce Bottle | API | Bottle | Fungal infections; fungal growth control |
| API Pond PIMAFIX Antifungal Pond Fish Infection Remedy 64-Ounce Bottle | API | Bottle | Fungal infections in pond fish |
| API Liquid Fungus Cure, 4-Ounce | API | Liquid bottle | Treats contagious fungal infections; barrier against secondary infections |
| API BettaFix Antibacterial & Antifungal Betta Fish Infection and Fungus Remedy 1.7-Ounce Bottle | API | Bottle | Antibacterial and antifungal therapy for bettas; promotes fin regrowth |
API PIMAFIX 16-Oz Antifungal Remedy

API PIMAFIX is designed to rapidly and safely treat fungal infections on the body and fins of both freshwater and saltwater fish. It uses an all-natural extract from West Indian Bay Trees to help fight fungus and cottony growth. The product is easy to dose, with guidance typically aligned to established tank size. It is commonly used as a first-line antifungal care in home aquariums and is suitable for use with established tank mates under typical water quality conditions.
API Liquid Fungus Cure, 4-Ounce

API Liquid Fungus Cure focuses on contagious fungal infections and helps prevent fungal growth on fish eggs before hatching. It also provides a protective barrier against secondary infections by supporting slime coat health and offering a synthetic treatment that complements other husbandry measures. This option is commonly chosen when fungal signs appear in both adult fish and fry tanks.
API PIMAFIX Antifungal 8-Oz

This smaller bottle variant provides the same antifungal action as the 16-ounce option, suitable for smaller tanks or budget-conscious hobbyists. It rapidly treats fungal infections on body and fins with the same all-natural bay tree extract. Regular monitoring of water quality remains essential for successful treatment outcomes.
API POND PIMAFIX Antifungal 64-Oz

Designed for larger volumes or pond environments, API Pond PIMAFIX provides antifungal treatment for pond fish in bigger setups. It shares the same plant-derived extract base aimed at fungal suppression and cottony growth, helping to prevent progression in outdoor or larger water features. Ensure proper filtration and pond-specific water parameters during treatment.
API BettaFix Antibacterial & Antifungal Betta

BettaFix combines antibacterial and antifungal action to treat infections that affect betta fish and related small tropical species. It helps healing of damaged fins and tissue while supporting fin regrowth. This product is often used when disease signs accompany wounds, ulcers, or after introduction of new fish to reduce disease risk in community tanks.
API General Cure Freshwater And Saltwater

General Cure is a broad-spectrum powder that targets various parasitic diseases and supports overall health. While not an antifungal product per se, it is often used in conjunction with antifungal treatments to address multiple potential pathogens in a single care plan. It is tailored for both freshwater and saltwater fish and may complement fungal-focused therapies when parasites co-occur with fungal signs.
Buying Guide
Key considerations when selecting a fungus cure for fish include tank type (freshwater vs. saltwater), fish species (betta, tropical community, pond fish), infection severity, and life stage. For light to moderate fungal infections, PIMAFIX products provide a targeted antifungal approach using bay tree extracts, and can be used across many setups. For eggs and fry, Liquid Fungus Cure can help prevent fungal spread before hatch, while BettaFix offers a combined antibacterial and antifungal option for fragile bettas.
Storage and dosing instructions are essential. Follow label directions for dosage, duration, and steps to monitor water quality during treatment. In ponds, larger volumes require higher quantities and longer treatment windows, along with appropriate aeration and filtration. Employ a quarantine tank when possible to isolate new or diseased fish and reduce cross-contamination in main displays.
Consider water parameters and seasonality. Warmer temperatures can accelerate disease progression but also influence treatment efficacy. If signs persist after the recommended course, re-evaluate tank conditions, perform partial water changes, and consult an aquatic veterinarian or a dedicated fish care resource. Combining antifungal care with good husbandry tends to yield the best outcomes for fish health.