Anti-Bacterial Fish & Coral Remedy: An all natural fish & coral treatment with tea tree extract (Melaleuca). Melafix Marine rapidly repairs damaged fins, ulcers and open wounds, and also reverses coral degradation. Anti-bacterial fish & coral remedy. An all natural fish & coral treatment w/tea tree extract. Rapidly repairs damaged fins, ulcers, & open wounds. Reverses coral degradation. Disease or wound treatment: shake well. Dose: add 5 ml per 10 u.s. gal. dose daily for 7 days. Melaleuca: Size: 16 oz.