[caption id="attachment_2919" align="alignnone" width="300"] Always make sure you have a thermometer so you can keep an eye on the temperature of the water.[/caption]
Thermometer
These are either submersible or can just stick to the glass. The latter is usually going to be accurate unless you are keeping delicate fish that might be sensitive to small changes in water temperature.
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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.