Rosy Barb
This small fish from Afghanistan and Bangladesh can withstand temperatures as low as the mid-60s Fahrenheit (18 C).
They are low-maintenance and perfect for a communal aquarium. The rose barb (Pethia conchonius, originally Barbus conchonius) is both easy to grow and one of the toughest barbs.
Gold Barb
The gold barb, sometimes known as the Chinese barb, is a common cold-water fish. Barbs are schooling fish, so keep them in groups of 5-6 or more.
A moderate current should be maintained in any aquarium containing gold barbs. Although a separate river tank is not required, some flow from a powerhead should be given.
The gold barb (Barbodes semifasciolatus, formerly Puntius semifasciolatus or Barbus schuberti) also has a green variant.
Two Spot Barb
This fish is indigenous to Nepal, India, and Pakistan. Pethia ticto, originally Barbus ticto, is a brilliant red omnivore two spot barb.
The darkness of its spots and the brightness of its red lateral color correspond to the quality of its varied diet; live food, flake food, and some algae are advised. This barb has no barbels, despite its name.
Bloodfin Tetra
Both the regular bloodfin (Aphyocharax anisitsi) and the false bloodfin (Aphyocharax dentatus), which are native to Southern Brazil and Paraguay, can withstand temperatures as low as the mid-60s.
They are peaceful omnivores that are easy to care for and highly hardy. As a result, bloodfin tetras are widely available at pet stores. These tetras prefer to live on the surface and are best kept in classrooms.
Buenos Aires Tetra
The Buenos Aires tetra (Psalidodon anisitsi, originally Hemigrammus caudovittatus) is widely available for purchase and can withstand temperatures in the mid-60s F (18 C).
Choose between the conventional and albino varieties. They, like bloodfin tetras, are undemanding and simple to care for. They are good for a communal tank, however they will devour live plants.
Goldfish
Goldfish (Carassius auratus), which originated in Asia, are possibly the most widely available fish in captivity. This popular and durable fish comes in a variety of appealing varieties.
Long, double caudal fins (tails) on fancy goldfish can be as long as the body. The comet goldfish has a long, single tail and is usually golden in color, although it can also be white, orange and white, or black, orange, and white.
Hillstream Loach
Gastromyzon punctulatus is a stunning bottom-dwelling fish from South and East Asia. Although these fish are rarely seen in pet stores, individuals can be discovered for sale on occasion.
They may not all like cool conditions, but most can endure temperatures in the mid to upper 60s F (15-20 C).
Pearl Danio
The pearl danio (Danio albolineatus), like the zebra danio, is highly hardy and easy to care for. It can withstand temperatures as high as the mid-60s and is widely available.
Although pearl danios are larger than zebra danios, they do not need to be maintained in classrooms. Sumatra, Laos, and Thailand are their natural habitats.