Of course, always use a dechlorinator to make tap water safe from chlorine and chloramine, which are commonly found in tap water and are poisonous to fish. However, bear in mind that your hot water tap could contaminate your clean water with common chemicals from your heating system – I usually boil some water from the cold tap to to mix with the cold water to avoid this. The water you add to your tank should be added slowly and should match the temperature in the tank as closely as possible. Note: always pay attention to water temperature when performing water changes, and don’t risk shocking your fish by pouring in cold water too quickly. The reason that the ideal Neon Tetra temperature range is relatively wide is that in the wild they experience temperature changes according to the seasons and time of day, so small fluctuations in your tank water temperature are actually a good thing as it mimics their natural habitat, as long as it doesn’t fall outside of this range. Tank temperature is never constant even with a heater because lights are switched on and off and the temperature of the room changes during the day. Ideally, the temperature for Neon Tetras in an aquarium should be between 72 and 80 degrees Fahrenheit (22 to 26.5 degrees Celsius). As such, the species originates from an area where the water temperature remains in the mid-80s all year round, although the surface temperature is always warmer than the depths of the river where Neon Tetras would be found, which is why it’s recommended to keep the temperature in your tank a little lower than this. Neon Tetras are native to South America, where they breed in the Amazon river basins of Brazil, Columbia and Peru.
Depending on the species and where they are originally found, some prefer temperatures of around 70 degrees Fahrenheit (21 degrees Celsius) all the way up to 80 degrees Fahrenheit (26-27 degrees Celsius) for those at the upper end of the scale. Tropical water conditions refer to the oceans and rivers in parts of the world where the temperature is above 68 degrees Fahrenheit (around 20 degrees Celsius). For tropical fish, it’s literally in their genes that they need warmer water temperatures – they’re just not built to survive in cold water. All aquarium fish thrive when their tank conditions closely match those of the natural habitat they’ve evolved in over millions of years. Do Neons need a heater? Quite simply, yes.
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