How Much Hydrogen Peroxide In 25 Gal Fish Tank?

How Much Hydrogen Peroxide In 25 Gal Fish Tank? The recommended concentration for use in fish tanks is 0-3% H2O2 solution. Can I put hydrogen peroxide in my aquarium? It is a weak acid. It has very strong oxidizing properties and is therefore a powerful bleaching agent that has found uses as a disinfectant. Even