Protect your fish with Seachem ParaGuard 100 mL, the only fish and filter-safe aldehyde-based parasite control available. Formulated without formaldehyde or methanol, it’s gentle on aquatic life and safe for both freshwater and marine aquariums. ParaGuard effectively treats external parasites, fungal, and bacterial infections without altering pH levels. Ideal for hobbyists and professionals alike, this broad-spectrum treatment helps maintain a clean, healthy, and stress-free aquatic environment.