[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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Tetra fish are known for their neon coloration. They mostly get along with other tetras, although they can be kept with other placid fish such as goldfish.
