PondCare MelaFix Antibacterial Remedy for Koi & GoldfishAPI Pond Melafix (formerly PondCare Melafix) is an antibacterial remedy for the treatment of common Koi and goldfish ailments, including Eye Cloud, Mouth Fungus, and Fin and Tail Rot. Melafix is an all natural treatment that promotes rapid healing of damaged fins and tissue, as well as ulcers and open wounds. Natural active ingredient treats bacterial fish infections Promotes healing of Koi and goldfish Rapidly repairs damaged fins and tissue Treats