Saltwater vs. Freshwater fish
When you go to the store, you have a decision to make. There are freshwater or saltwater fish. This will help you decide what ones you want.
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FRESHWATER FISH IS...
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Freshwater fish are less expensive. You only have to clean the tank once a month. A freshwater tank is smaller. (So my "How to clean your tank" is for freshwater) And freshwater fish aren't brightly colored. But they do use water from your sink. And they aren't so big.
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SALTWATER FISH IS...
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A saltwater fish can get REALLY big. Saltwater fish are also brightly colored. The temperature maters with them. They also need saltwater to live in And a really big tank. That makes it expensive.
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Maybe that helped you decide but if it didn't, go to a petstore and choose yourself!