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| welcome to Cool Fish Tank |
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| Product by Mr. It |
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| Types of Filter |
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| Choosing the right fish for Your Aquarium |
| Common freshwater fish Families |
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| Undergravel Flows In conventional flow UG (left) water is drawn down through the filter bed (substrate) and up the uplift pipe (by airlift or powerhead). In revese flow (right) a canister filter pumps water down the uplift and up through the substrate. |
