Since freshwater fish require a warm climate, you will need an aquarium heater, anchored with suction cups inside the tank. Set the heater's thermostat to a constant 78 to 80 degrees Fahrenheit. Instead, create a day-night cycle for your fish with artificial tank lighting. Use fluorescent, full-spectrum lights set on an automatic timer to establish a healthy schedule. Bringing fish home Buy fish that are active, have clear eyes and smooth fins.
Tetras are easy to care for and are ideal for aquariums because of their communal nature.
For the most peaceful behavior and best color, keep them in schools of three, five or seven. Their waste products will form just enough ammonia to attract beneficial bacteria. This process takes about three weeks and will make the tank water hazy. After the cloudiness clears, take a water sample to the pet store for ammonia testing. If it is free of ammonia, you can add more fish.