[caption id="attachment_2917" align="alignnone" width="300"]
Substrate is just the material that lines the bottom of the tank.[/caption]
Substrate
This is just the gravel that lines the bottom of the aquarium. You will need about one pound of gravel for every gallon of water in the tank.
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Guppy fish are very social and are typically owned in schools due to their friendly nature. They are one of the most popular types of domestic freshwater fish.
