Vetsupply: Blue Planet White Spot is a broad-spectrum antibiotic use for treating white spot (Ichthyophthirius multifiliis), velvet disease (oodinium spp.), and fungal disease in goldfish, freshwater, and tropical freshwater fish. White Spot is a common fish parasite that can be transmitted through new fish or plants, or it might emerge when fish are disturbed due to temperature changes or environmental changes.