Trigonostigma heteromorpha is another popular schooling fish that does great in a group of six to eight. In this picture, the male is on the left, and the female is on the right. German blue rams form monogamous pairs that show parental care over their young. The key thing to remember is that this South American dwarf cichlid likes higher temperatures around 85☏, so keep them with other hot water fish like cardinal tetras and Sterbai cory catfish. A male, on the other hand, is larger, has an extended dorsal ray, and no blue spangles inside his black spot. A female has a shorter dorsal fin, pinkish belly, and blue spangles inside the black spot on the side of her body. A 20-gallon aquarium can house one male with one or two females for company.
Speaking of boldly patterned fish, take a look at the German blue ram, or Mikrogeophagus ramirezi. Leopard danios are an easy, budget-friendly schooling fish that aren’t as commonly seen as their famous cousin, the zebra danio. To prevent them from hogging all the food, pair them with other fast, midwater fish like tetras and rasboras for a highly entertaining aquarium. Get a group of six, and watch them speed around the top third of the fish tank. The great thing about these danios is how resilient they are – they can live at room temperature without a heater and are happy in a wide range of pH and water hardness. Looking for a hyper, interactive fish that isn’t afraid to say hello? Check out the leopard danio! This brightly spotted schooling fish looks like a little trout and comes in both short and long fin varieties. Julidochromis ornatus (or the golden Julie) is one of the most popular varieties because of its colorful markings and small size. Compared to other African cichlids, Julies are relatively peaceful fish and can cohabitate with other small community fish that prefer swimming in the middle or top of the tank. Depending on the amount of cover provided, you can keep three to six of them in a 20-gallon long tank or maybe a single breeding pair in a 20-gallon high tank. Provide them with lots of rockwork to simulate their natural habitat, and they’ll feel right at home. They have the amazing ability to swim vertically, sideways, and upside-down in order to stay close to surfaces and hiding spots. This stunning, three-inch fish is the perfect choice if you’ve ever wanted to try keeping Tanganyikan cichlids. With all these possibilities, check out our favorite freshwater fish to spice up your aquarium with their beautiful colors and interesting behaviors. 20-gallon aquariums are one of the most popular tank sizes among fish keepers because they’re small enough to keep in a bedroom but big enough that you can choose from a wide variety of fish to keep.
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