Diamond Tetra (Moenkhausia pittieri)
The diamond tetra is a small freshwater fish found near Lake Valencia in Venezuela. In the aquarium trade, it is popular for its very iridescent scales, which catch and reflect light like crystals. Like many other tetra species, this fish is best kept in a small group.
Elma via Flickr

Diamond Tetra (Moenkhausia pittieri)

The diamond tetra is a small freshwater fish found near Lake Valencia in Venezuela. In the aquarium trade, it is popular for its very iridescent scales, which catch and reflect light like crystals. Like many other tetra species, this fish is best kept in a small group.


Elma via Flickr

Drought Resistant Killifish (Nothobranchius geuntheri depicted)
The genus Nothobranchius are a group of freshwater fish that live in the mud pools of the African plains. These pools are only filled throughout the rainy season and dry up seasonally. As an adaptation to this extreme environment, the fish have evolved an extremely fast maturity rate and produce eggs that resist the dessication of their environment.
 Their eggs have the amazing ability to withstand being dried out. They lay in a state of diapause, resting periods when development ceases, over the time when their pools are dry. When the rain finally comes, a series of biochemical messages causes the eggs to resume development. These young fish must race to mature and breed before their pools dry out again in a couple of months.
Adilson Borszcz via Flickr

Drought Resistant Killifish (Nothobranchius geuntheri depicted)

The genus Nothobranchius are a group of freshwater fish that live in the mud pools of the African plains. These pools are only filled throughout the rainy season and dry up seasonally. As an adaptation to this extreme environment, the fish have evolved an extremely fast maturity rate and produce eggs that resist the dessication of their environment.

 Their eggs have the amazing ability to withstand being dried out. They lay in a state of diapause, resting periods when development ceases, over the time when their pools are dry. When the rain finally comes, a series of biochemical messages causes the eggs to resume development. These young fish must race to mature and breed before their pools dry out again in a couple of months.

Adilson Borszcz via Flickr

Bubble Eye Goldfish  (Carassius auratus auratus)
Goldfish have been selectively bred for hundreds of years, resulting in a wide variation in morphology. The popular ornamental fish was first domesticated from wild carp in China, where orange mutations of the normally silver fish were recorded in the Jin Dynasty (265 - 420). 
In the Tang dynasty (618 - 920), carp were commonly kept in ornamental ponds and were selectively bred for a gold mutation. By the Song Dynasty (920 - 1279), the domestication of goldfish was firmly established. 
Today, there are about 300 distinct breeds recognised in China. Some popular varieties include features such as the bubble eye, telescope eyes, fancy tails and a compressed body. Many of these features provide significant disadvantage for the fish and as such, specialist care is needed to successfully raise and breed them. 
Jordan Hartig on Wikimedia Commons

Bubble Eye Goldfish (Carassius auratus auratus)

Goldfish have been selectively bred for hundreds of years, resulting in a wide variation in morphology. The popular ornamental fish was first domesticated from wild carp in China, where orange mutations of the normally silver fish were recorded in the Jin Dynasty (265 - 420).

In the Tang dynasty (618 - 920), carp were commonly kept in ornamental ponds and were selectively bred for a gold mutation. By the Song Dynasty (920 - 1279), the domestication of goldfish was firmly established.

Today, there are about 300 distinct breeds recognised in China. Some popular varieties include features such as the bubble eye, telescope eyes, fancy tails and a compressed body. Many of these features provide significant disadvantage for the fish and as such, specialist care is needed to successfully raise and breed them.

Jordan Hartig on Wikimedia Commons

White Cloud Mountain Minnow (Tanichthys albonubes)
The white cloud mountain minnow is a small freshwater fish native to southern China and Vietnam. Despite being extremely common in the aquarium trade, the fish is exceptionally rare in the wild due to habitat degredation. The fish was thought to be extinct in the wild for 20 years in the 1980s. Since then, isolated wild populations have been found.
Public domain image

White Cloud Mountain Minnow (Tanichthys albonubes)

The white cloud mountain minnow is a small freshwater fish native to southern China and Vietnam. Despite being extremely common in the aquarium trade, the fish is exceptionally rare in the wild due to habitat degredation. The fish was thought to be extinct in the wild for 20 years in the 1980s. Since then, isolated wild populations have been found.

Public domain image

Kuhli Loach (Pangio kuhli)
The kuhli loach is a small freshwater fish native to Indonesia and the Malay Peninsula. Like many other members of the loach fish, the kuhli loach is long and thin, which suits its burrowing habits. The fish is popular in the aquarium trade and is well suited for the tropical tank.
© Robert Mollik via Wikimedia Commons

Kuhli Loach (Pangio kuhli)

The kuhli loach is a small freshwater fish native to Indonesia and the Malay Peninsula. Like many other members of the loach fish, the kuhli loach is long and thin, which suits its burrowing habits. The fish is popular in the aquarium trade and is well suited for the tropical tank.

© Robert Mollik via Wikimedia Commons

Red Rainbowfish (Glossolepis incisus)
Rainbowfish are a family of small freshwater fish native to Australia and New Guinea. Their name comes from their highly reflective scales that range in a many different colours across species.
Aquarianer Schweiz on Flickr

Red Rainbowfish (Glossolepis incisus)

Rainbowfish are a family of small freshwater fish native to Australia and New Guinea. Their name comes from their highly reflective scales that range in a many different colours across species.

Aquarianer Schweiz on Flickr

I keep this fighting fish in our 5 ft community tank. Despite spending a week or two hiding from everything, it has now become one of the most active and visible fish in the whole aquarium.
Fighting fish can definitely benefit from a large fish tank.

I keep this fighting fish in our 5 ft community tank. Despite spending a week or two hiding from everything, it has now become one of the most active and visible fish in the whole aquarium.

Fighting fish can definitely benefit from a large fish tank.