Tetra Medica Fungi Stop is effective against fungal infections, and as a preventive measure for wounds in tropical ornamental fish. Use Tetra Medica Fungi Stop if you observe the following symptoms or problems in your fish: Cotton Wool loke growths on body or fins Mouth region eaten away often covered with cotton wool loke growths Cotton Wool like growths on fish eggs A highly effective formula. Effective against fungal infections of fish eggs Promotes healing of wounds by protecting the mucous membranes.