Introduction  |  Aquarium Choices & Considerations Filtration  |  Filter Systems |  Filter Media Temperature Control |  Lighting Creating the Aquatic Environment Aquarium Decorative Features and Characteristics Water  |  Live Plants  |  CO2 In The Aquarium Introducing Fish  |  Fish Care  |  Feeding Aquarium Maintenance  |  Basic Maintenance Guide   Always allow approximately 30 minutes before plugging in. Always allow approximately 30 minutes after unplugging before removal or partial water changes. Always set temperature with the use of an aquarium thermometer. Verify temperature on a daily basis. Always unplug your heater if you must place your hands in the aquarium. When setting temperatures with a clip-on heater such as a Hagen Radiant Heater, remove the safety cap situated on the temperature control knob to adjust temperature, then replace to prevent clockwise movement.