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Fish tank Plants Heater Tropical fish Gravel There might be other things depending on if you are keeping tropical plants or cold water plants.
Add an aquarium heater. Make sure you choose a heater with the correct wattage for your aquarium's water volume.
plants need cold water to survive
what type of aquarium tropical (heater needed) cold water or marine (saltwater)
cold water
Goldfish are meant to live in cold water, not the warm water in a tropical aquarium. This is a huge reason why goldfish and tropicals shouldn't be in the same tank.
cold water is much heavier than hot water . the water becomes warm
it becomes a mixture of a warm and cold water :)))
that happens because cold water is heavier than hot water.
Yes, if they are cold water fish and they are in there for a long time. Tropical fish could stand the water a bit hotter. But not too hot. Though i would'nt try it.
Plants do not get as cold
warm water