Pond-Safe Medications: Stress Coat, Melafix, Pimafix for Koi

Treating Cat-Attacked Koi: Which Products Are Pond-Safe?

An aquatic center claimed Stress Coat, Melafix, and Pimafix are for aquariums only. That's partially true—the standard bottles are dosed for small volumes, making pond use impractical and expensive. However, pond-specific versions exist.

Pond vs. Aquarium Formulations

• Stress Coat Pond Formula: Treats tap water, replaces slime coat, heals wounds. Dosed per 100 gallons.
• Melafix Pond: Antibacterial for open wounds, fin rot, ulcers. Safe for plants, biofilters.
• Pimafix Pond: Antifungal for cottony growth, mouth fungus. Often used with Melafix.

Where to Buy

1. Local Pond/Garden Centers: Carry API Pond, TetraPond, Microbe-Lift lines.
2. Online Retailers: Amazon, Chewy, PondMegaStore, The Pond Guy.
3. Manufacturer Websites: Tetra-Fish.com has dealer locator; API (Mars Fishcare) lists pond products.

Cost-Saving Tip

If only aquarium bottles are available, you *can* use them—but calculate dosage carefully. Example: 1 tsp treats 10 gallons (aquarium) vs. 1 cup per 600 gallons (pond). For a 2,000-gal pond, you'd need ~3.3 cups of aquarium Melafix—costly but feasible in emergencies.

Treatment Protocol for Cat Wounds

1. Test water (ammonia, nitrite, pH) and correct issues first.
2. Add pond salt at 0.1% (1 lb/100 gal) to reduce stress.
3. Dose Melafix Pond + Pimafix Pond per label for 7 days.
4. Maintain high aeration—medications lower oxygen.
5. Monitor for secondary infections; consult a koi vet if ulcers deepen.

Pond medications exist—don't let an aquarium-store clerk limit your options.