These fish stand out with their vibrant green and orange vertical stripes which is why they are often used as centerpiece species. Rainbow Darters belong to the genus Etheostoma, a family of fish typical of North America, although there are also some in Mexico.Īs adults, these fish can reach a maximum size of 3.5 inches (9 cm). North American Rainbow Darter Fish – Etheostoma caeruleumĪ certain level of experience is required, especially when it comes to the food, as they are known for being picky eaters In my experience, since this is a schooling fish, it’s best to keep a group of at least 7 Danios, as they tend to form hierarchies and become less aggressive. However, they have a habit of harassing large-finned fish because they see them as a threat. Zebra Danios are pretty peaceful which makes them a great fit for community tanks. You can easily recognize Zebra Danios thanks to the horizontal blue stripes that run along their entire torpedo-shaped body. These fish are usually 2.2 inches long, but some individuals can reach 2.5 inches. The zebrafish from the Danio genus is among the more popular fish in the hobby. Zebra Danio – Danio rerioĢ.2 inches (5.6 cm) but on a rare occasions a specimen can reach 2.5 inches in length (6.3 cm) In fact, I’ve seen that most of the time, Peacock Gudgeons prefer to hide among plants, rocks, and driftwood to avoid confrontations. Sometimes you’ll see the males fighting each other, but that’s nothing to worry about since they love to live in groups. Peacock Gudgeons are quite peaceful fish and have no problems living with other animals of a similar size. This gorgeous freshwater fish can reach a size of about 2.5 to 3 inches (6.3 cm) in the wild. This fish has a series of vertical lines of red and neon blue along its entire body, but what is most striking is the series of vibrant yellow lines that surround its fins. The Peacock Gudgeon is actually the only member of the genus Tateurndina and it’s native to Papua New Guinea. Peacock Gudgeon – Tateurndina ocellicauda In case you’re a total beginner, check out this post first to learn more about what you’ll need for a freshwater fish tank.Īnyways, here are the finest freshwater fish for a 20-gallon aquarium: 1. In this post, I’m going to list some of the best fish species you can have in a tank of these dimensions. At the same time, you can build a beautiful aquarium with a good variety of fish and decorative elements. ![]() ![]() What’s The Biggest Freshwater Fish You Can Put in a 20-Gallon Tank? The 12 Best Freshwater Fish for a Bustling 20-Gallon TankĪ 20-gallon tank is probably the best option for novice fish keepers and intermediate hobbyists, as you can place it almost anywhere in your home or office.
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