First, we should look at fish that may not need a heater and should survive power outages, for the beginner Aquarium Keeper. In this class, some of the best fishes will be your Guppy, White Cloud, Rosy Barb, Platy, Pearl Danio and Clown Killifish. If the Aquarium is not over-stocked and it is kept clean with good filtration maintenance, there should not be a problem. Regular 20% water changes with the use of Microbe-Lift Special Blend and Gravel & Substrate Cleaner will keep a happy and healthy community tank, year-round.
In Exotic fish, Planted or Marine tanks, there are suggested temperatures of 78°-82°F for your fish and 73°-77°F for your Planted or general Marine tank. For this, a reliable thermometer will be an important tool. A tank heater can be used during the nights to protect temperature sensitive fish. Do your research when buying fish for the tank.
The next concern is to protect your tank from drafts in your home. If your tank is near a door or window, use towels to prevent super cooling of the water. Keep the water clean so the fish will not become stressed.
