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Different fish also have different water preferences in terms of temperature and hardness, so be sure that the conditions in your tank are suitable for the type of fish you want. Some fish species prefer to lounge around, while others need more room to swim, so you must do your research before picking the right fish for your tank. In addition, research the species’ behavior and compatibility with other kinds of fish before making a purchase, as some are peaceful while others are aggressive. That’s because most pet stores sell juvenile fish that haven’t reached maturity. Related article: How Many Fish in A 20 Gallon Tank? (With 5 Stocking Ideas) Final Thoughtsīefore buying any fish for your 20-gallon tank, consider how big the fish will be when it’s fully grown.

6 Endler’s Livebearers (more females than males, M-F 1:2 ratio).

So, if you’re stocking a 20-gallon tank, here are some popular fish combos to consider: Combo #1 For example, the pea puffer is an unsuitable tank mate in a small aquarium because they are highly territorial or aggressive, despite only being 1.4 inches long. It is best to choose peaceful fish if you want different species living together harmoniously. A school of smaller fishes can occupy the rest of the tank along with a few calm bottom dwellers such as shrimp or catfish. Having one or two larger “Centerpiece” fish is generally a good idea.

Your aquarium will stay healthy and balanced by stocking your 20-gallon tank with different fish. What Are the Most Popular Fish Combo to Put in a 20-Gallon Tank? Tetra LED Hood 30 inches by 12 Inches, Low-Profile Aquarium Hood with Hidden Lighting. Aqua Culture 20 Gallon Fish Tank Hood with LED Light. They prefer a tank temperature between 21-26 degrees Celsius (70-78 Fahrenheit). Tetra Bubbling LED Aquarium Kit 1 Gallon, Hexagon Shape, with Color-Changing Light Disc, Acrylic. They can grow to be about 4 inches tall and have a lifespan of 5 years if you take proper care of them. Cory Catfish are easy to care for because they won’t attack other tank mates.

They use their dorsal fin to point up and stay hidden when they feel threatened. This group of small fishes has bodies armored by bony plates and spines that can be quite sharp and sometimes venomous.Ĭory Catfish are peaceful, armored fish that have short faces, flat undersides, and pectoral fins. Cory Catfish is a stunning freshwater option for 20-gallon fish tanks.