Question: How to Kill Green Hair Algae in a Freshwater Aquarium

  Options: 
 A. To quickly kill green hair algae in an aquarium, you can spot treat with 3% Hydrogen peroxide, around 1mL per 10g water volume. Turn off the filters, and fill a syringe with the peroxide. Spray directly on the algae. Leave the filters off for about 15 minutes, do a 25% water change, and turn the filters back on. You should notice the algae starting to turn reddish or brown by the next day. Repeat as necessary.
 B. To quickly kill green hair algae in an aquarium, you can spot treat with 3% Hydrogen peroxide, around 1mL per 10g water volume. Turn off the filters, and fill a syringe with the peroxide. Spray directly on the algae. Leave the filters off for about 15 minutes, do a 225% water change, and turn the filters back on. You should notice the algae starting to turn reddish or brown by the next day. Repeat as necessary.
Answer: A