Best Freshwater Fish Under $20: Affordable Aquarium Picks
Building an aquarium does not have to drain your wallet. Some of the most rewarding, colorful, and beginner-friendly freshwater fish are also among the most affordable, often available at modest prices. This guide highlights popular freshwater fish that are commonly budget-friendly, along with what makes each a smart pick for a value-minded community tank.
Pricing varies widely by region, size, color strain, and supplier, so treat the “under $20” framing as a general guideline rather than a fixed quote. For current pricing and availability, it is always best to check with your local fish store.
What Makes a Fish a Good Budget Pick?
The best affordable fish tend to share a few traits: they are widely bred and readily available, they are hardy and forgiving of small beginner mistakes, and they do well in standard community setups without specialized equipment. Many are also social fish kept in groups, so a small shoal can fill a tank with movement and color without a large outlay. If you are brand new to the hobby, our roundup of the best fish for beginner aquariums pairs well with this list.
Guppies
Guppies are perennial favorites for value: they are inexpensive, endlessly colorful, and quick to breed. A small group brings constant activity to the upper levels of a tank, and they adapt well to a range of community conditions. Their hardiness and low cost make them one of the classic starter livebearers. See our guppy care guide for details on keeping them thriving.
Neon Tetras
Few fish deliver as much color per dollar as the neon tetra. These small schooling fish shimmer with blue and red, and they look their best in groups of six or more, which keeps the per-fish cost low while maximizing the visual payoff. They suit calm, well-established community tanks. Our neon tetra care guide covers their needs in full.
Corydoras Catfish
Corydoras are charming, peaceful bottom-dwellers that work the lower levels of the tank and are widely available at reasonable prices. Kept in groups of five or more, they are social, active, and endlessly entertaining as they forage. Learn more in our Corydoras care guide.
Chili Rasboras and Other Nano Fish
For small tanks, tiny nano fish offer big value: a handful of chili rasboras or a small group of celestial pearl danios can create a vibrant display in a modest footprint. Because they stay small, they suit nano aquascapes and let budget-conscious keepers stock a complete community in less space. For more compact options, see our list of the best fish that stay under 3 inches.
Affordable Tetras and Schooling Fish
Beyond neons, many tetras are inexpensive and rewarding when kept in proper groups. Schooling species shine in numbers, so buying a small shoal at once is both better for the fish and efficient on cost. Our tetra care basics and our broader guide to the best schooling fish for freshwater aquariums can help you plan a lively, budget-friendly community.
Don’t Forget Invertebrates
Affordable stocking is not limited to fish. Shrimp and snails add interest, help with algae and cleanup, and are often very budget-friendly, especially once a colony establishes. Our guides to the best shrimp for beginners and cherry shrimp care are great starting points.
Tips for Stocking on a Budget
The smartest way to save money is to avoid losses. Start with a fully cycled aquarium, add fish gradually, and choose hardy, compatible species suited to your tank size. Buying small groups of social fish at once, picking species that breed readily, and prioritizing healthy stock over the cheapest possible price all stretch your budget further over time.
Visit Us in Cheyenne
Want help building a beautiful aquarium without overspending? Stop by Tropical Treasures Wyo at 190 S College Drive, Ste D in Cheyenne, WY. We offer free in-store water testing and friendly, no-pressure advice, open Monday through Saturday, 10 AM to 7 PM. You can also get in touch with our team with any questions.