Seachem ParaGuard is a unique, fish and filter-safe parasite control solution, formulated with a 10% aldehyde base, specifically designed for treating parasites on fish. Unlike harsh formalin-based treatments that are toxic and challenging to use, ParaGuard is free from formaldehyde and methanol, ensuring it does not affect pH levels. It features a specialized mix of aldehydes, malachite green, and protective polymers that work together to effectively eliminate a wide range of ectoparasites (such as ich) as well as external fungal, bacterial, and viral infections (like fin rot). This product is especially beneficial in quarantine or hospital tanks for newly arrived fish and should be used whenever introducing new fish to an established aquarium community. Available at shop.morphmarket.com.