ParaGuard is a unique dialdehyde based treatment with synergistic malachite green and fish protective polymers. It is the only liquid medication on the market to control parasitic, bacterial, fungal, and viral infections. It will not damage the biological filter. It is exceptionally effective in dips. It is a highly effective and economical solution for problems of ectoparasites and infectious lesions. It will not affect the pH. A 100 mL bottle treats 200 gallons. Marine and freshwater use. DIRECTIONS: In the aquarium, use 1 mL (top mark on enclosed dispenser) to every 2 gallons. Repeat daily as required as long as fish show no stress. For 1 hour dips, use 3 mL per gallon. Dips may be extended if fish show no evidence of stress. Aquarium Use Only! Keep Away from Children! WARNING! Avoid any contact with eyes. In case of eye exposure, promptly wash with copious amounts of water and seek medical attention