Nitrofurazone, Potassium Dichromate.
Directions: Add one tablet to each 10 gallons of aquarium water.
Note: For aquariums 40 gallons or larger, and for soft and/or acid water with low alkalinity, dissolve tablets before adding to aquarium. Remove carbon from filter during use. If necessary, second dose may be added in four days. Change 25% of the water before adding second dose. Specially formulated to protect fish from secondary infections. May stain aquatic and non-aquatic materials.
* Ingredients and dosage listed are for informational purposes only and are subject to change by the manufacturer. Always refer to the manufacturer and actual product label/inserts for current ingredients, recommended dosage, precautions and warnings before use.