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10 Best 20 Gallon Fish Tank
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Buying Guide for the Best 20 Gallon Fish Tank
Choosing a 20-gallon fish tank is a great way to start a home aquarium that is both manageable in size and large enough to offer some flexibility in fish selection. Before buying, think about where you’ll place the tank, the types of fish or aquatic animals you want to keep, and how much time you can dedicate to upkeep. Understanding key features of fish tanks will help you make a choice that is easy to maintain and enjoyable for both you and your aquatic pets.Tank MaterialThe two main materials for fish tanks are glass and acrylic. Glass tanks are heavier, more scratch-resistant, and often less expensive, but they are more prone to breaking if dropped. Acrylic tanks are lighter and more impact-resistant, but can scratch more easily. If you plan to move the tank frequently or have young children around, acrylic might be a better fit. If you want to avoid scratches and don’t plan to relocate the tank, glass could be your choice.
Tank Shape20-gallon tanks come in different shapes, such as standard rectangular, high (tall), and long. Standard and long tanks offer a greater surface area, which is good for oxygen exchange and swimming space for fish that like to move horizontally. High tanks are taller and may work better for showcasing certain plants or vertical decor, but provide less surface area for gas exchange. If you’re planning to keep active swimmers, stick to standard or long tanks. For vertical aquascapes or species that use all water levels, a high tank could be interesting.
Lid or HoodA lid or hood is the cover on top of your tank, which helps prevent fish from jumping out and reduces evaporation. Some lids also include built-in lighting. If you have jumping fish or are worried about spills, a good-fitting lid is crucial. If you plan to keep live plants or showcase your tank, look for a hood with adequate lighting or space to add your preferred lights.
Filtration SystemA filtration system helps keep water clean by filtering out debris, toxins, and waste. Filters vary in power and type, commonly including hang-on-back, sponge, and internal filters. For a 20-gallon tank, make sure the filter is rated for at least 20 gallons (higher is fine) and offers mechanical, chemical, and biological filtration. If you have more fish, messy eaters, or want crystal-clear water, opt for a stronger filter. For delicate or low-flow environments, choose a gentler setup.
LightingTank lighting is important for both viewing your fish and supporting plant growth if you have live plants. LED lights are energy-efficient and provide good brightness. If your main focus is fish only, standard lights will do. If you want to grow live plants, look for full-spectrum lighting suitable for aquarium plants. The amount and type of lighting should match your tank inhabitants and your aesthetic preferences.
Dimensions and PlacementWhile all 20-gallon tanks hold the same volume, their exact dimensions may differ based on shape. Make sure your chosen tank fits in your intended space and that the surface can support its weight (a filled 20-gallon tank weighs about 200 pounds or 90 kg). Consider access to electrical outlets and ease of maintenance. Placement in a stable, safe, and convenient spot will make setup and ongoing care much easier.