Best 20 Gallon Aquarium: A Guide To Your First Fish Tank

guide to 20 gallon aquarium

When it comes to venturing into the world of fishkeeping, choosing the right aquarium is a crucial first step. A 20-gallon tank is an excellent choice for beginners, offering a versatile size that can accommodate a variety of fish species.

However, with numerous options available in the market, it can be overwhelming to determine which aquarium will best suit your needs. In this comprehensive guide, we will explore the top 20-gallon aquarium options, providing detailed reviews and essential considerations to assist you in making an informed decision.

Whether you're a novice or an experienced fish enthusiast, this guide will equip you with the knowledge and insights necessary to create a thriving aquatic ecosystem.

Key Takeaways

  • There are several options for 20-gallon aquariums, including glass and acrylic tanks.
  • The Perfecto All Glass Aquarium is scratch-resistant and corrosion-proof but does not come with a screen top.
  • The Tetra 20 ColorFusion Aquarium Kit is customizable and includes decor and accessories, but it is slightly expensive.
  • The SeaClear Acrylic Aquarium is lightweight and impact-resistant but also slightly expensive.
  • The Aqueon Long Aquarium has high-quality construction and clean edges, with multiple trim styles available. The Marina LED Aquarium Kit includes energy-efficient LED lighting but some users reported issues with the filter.

Top 20 Gallon Aquarium Options

best 20 gallon aquariums

When it comes to finding the best 20 gallon aquarium options, there are several top-rated choices that offer durability, functionality, and aesthetic appeal.

One popular choice is the SeaClear Acrylic Aquarium. Made from high-quality acrylic material, this tank offers numerous benefits.

Acrylic tanks are known for their durability and strength, as they are 17 times stronger than glass. They are also lighter in weight, making them easier to handle and transport. Additionally, acrylic tanks have better insulation properties, which leads to more stable water temperatures. The clarity of acrylic is superior to glass, providing a crystal-clear view of the underwater environment.

Maintenance of a 20 gallon tank is essential for the health of the aquatic ecosystem. Regular cleaning, water changes, and proper filtration are key aspects of tank maintenance, ensuring optimal water quality and the well-being of the fish and plants.

Handpicked Reviews of Aquarium Kits

Continuing our exploration of the best 20-gallon aquarium options, let's now delve into the handpicked reviews of aquarium kits that offer durability, functionality, and aesthetic appeal.

When it comes to choosing the material for your aquarium, there are two main options: glass and acrylic tanks. Glass tanks, such as the Perfecto All Glass Aquarium and the Aqueon Long Aquarium, are known for their scratch resistance and long-lasting shine. Acrylic tanks, like the SeaClear Acrylic Aquarium, offer the advantage of being lightweight and impact resistant.

When selecting a fish tank size and dimensions, it is important to ensure that it fits your available space. Additionally, factors such as the inclusion of accessories like filters, heaters, and lighting, as well as customizability and price, should be considered.

Considerations for Choosing a Fish Tank

choosing the right fish tank

Choosing the right fish tank requires careful consideration of various factors to ensure optimal functionality and suitability for your aquatic pets. Here are some important factors to consider when choosing a fish tank:

  • Pros and cons of glass vs acrylic tanks: Glass tanks are scratch-resistant, corrosion-proof, and offer a long-lasting shine. However, they can be heavy and prone to breakage. Acrylic tanks, on the other hand, are lightweight, impact-resistant, and offer multiple shape options. However, they can be more expensive and prone to scratching.
  • Factors to consider when choosing a tank size: Consider the available space in your home and the specific requirements of the fish species you plan to keep. A 20-gallon tank provides a good balance between size and maintenance. It is important to ensure that the tank size is suitable for the number and size of the fish you plan to keep, as overcrowding can lead to poor water quality and stress for the fish.

Necessary Equipment for a 20-Gallon Tank

To properly equip a 20-gallon aquarium, it is essential to have the necessary equipment that will ensure the optimal environment for your aquatic pets. One of the most important pieces of equipment is the filter. Choosing the right filter for a 20-gallon tank is crucial as it will help maintain the water quality by removing debris and toxins. Look for a filter that is specifically designed for this tank size and has a sufficient flow rate.

Another beneficial addition to a 20-gallon aquarium is live plants. Live plants offer numerous benefits, including oxygenation, natural filtration, and aesthetic appeal. They help to create a more natural and balanced ecosystem for your fish, as well as provide hiding spots and grazing areas. Some popular choices for live plants in a 20-gallon tank include Java Fern, Anubias, and Amazon Sword.

Common FAQs About 20-Gallon Aquariums

frequently asked questions about 20 gallon aquariums

One common question that arises when it comes to 20-gallon aquariums is whether tropical fish can be kept in this tank size. The answer is yes, tropical fish can be kept in a 20-gallon tank as long as certain conditions are met. Here are some common FAQs about 20-gallon aquariums:

  • Cleaning frequency for a 20-gallon tank: It is recommended to perform a partial water change of 20-25% every 1-2 weeks to maintain water quality and remove any accumulated waste.
  • Recommended water temperature for tropical fish in a 20-gallon tank: The water temperature should be maintained between 75-80°F (24-27°C) for most tropical fish species to thrive and remain healthy.
  • Can I use tap water in my aquarium? Tap water can be used, but it should be treated with a water conditioner to remove chlorine, chloramines, and heavy metals that can be harmful to fish.
  • How many fish can I keep in a 20-gallon tank? The number of fish that can be kept in a 20-gallon tank depends on the size and species of the fish. As a general guideline, it is recommended to have 1 inch of fish per gallon of water, accounting for the fish's adult size.
  • What is the recommended temperature for a 20-gallon tank? The recommended temperature for a 20-gallon tank is 75-80°F (24-27°C) for tropical fish, as this range closely mimics their natural habitat and promotes their overall well-being.

Frequently Asked Questions

How Often Should I Feed the Fish in My 20-Gallon Aquarium?

To ensure the health and well-being of the fish in your 20-gallon aquarium, it is recommended to feed them once or twice a day, offering an amount of food that they can consume within 2-3 minutes. Overfeeding can lead to water quality issues and health problems for the fish.

What Types of Fish Are Suitable for a 20-Gallon Tank?

When considering fish for a 20-gallon tank, it is important to choose species that are suitable for the tank's size and water parameters. Popular choices include small schooling fish like tetras, guppies, and rasboras.

How Long Does It Take to Cycle a 20-Gallon Aquarium?

The optimal duration for cycling a 20-gallon aquarium depends on several factors, such as the type of bacteria used and the ammonia levels. Generally, it takes about 4-6 weeks to establish a stable and healthy nitrogen cycle in a newly set up aquarium.

Can I Keep Live Plants in My 20-Gallon Aquarium?

Live plants can thrive in a 20-gallon aquarium, providing numerous benefits such as improved water quality, oxygenation, and a natural aesthetic. However, it is crucial to avoid common mistakes and consider CO2 injection for optimal plant growth.

How Often Should I Test the Water Parameters in My 20-Gallon Tank?

The frequency of water testing in a 20-gallon tank depends on factors such as the number of fish, feeding habits, and filtration system. Regular testing is essential for maintaining water quality and ensuring the health of your aquatic ecosystem.


In conclusion, selecting the best 20-gallon aquarium requires careful consideration of various factors. These factors include tank material, size, included accessories, customizability, and price.

The top options mentioned in this guide, including the Perfecto All Glass Aquarium and Tetra 20 ColorFusion Aquarium Kit, offer a range of features to suit different preferences.

Additionally, understanding the necessary equipment for maintaining a healthy tank is crucial. By following this comprehensive guide, you will be well-equipped to embark on your journey of owning a thriving fish tank. It will be like a compass guiding you to the depths of aquatic bliss.