Beginners Guide - Cyprinids.

White Clouds, Danios, Rasboras, and Barbs are all Asian fish related to the Carp and the Minnow. All of these fish belong to the family Cyprinidae. White Clouds, Danios, Rasboras, and Barbs are small, active, hardy, and colorful.

White Cloud Mountain Minnows - Tanichthys albonubes
Found in mountain streams in China, White Clouds can be kept in unheated tanks (down to 55F). Some people advise against putting these fish in tropical tanks but I have found that they do fine in heated aquaria as well, as long as the temperature is not kept above the mid 70s.
They can be fed any small food and they spawn often but fry will not be seen unless the parents are removed to another tank. White Clouds are brown with a red tail and a silvery white line down the side that shines in the light. They get to be 1 1/2" long.

Danios
Several species of Danios are often found in pet stores, including the Giant Danio, Danio aequipinnatus, the Zebra Danio - Brachydanio rerio, the Leopard Danio - Brachydanio frankei, and the Pearl Danio - Brachydanio albolineatus. These fish are fast swimmers and are always in motion. Different patterns of blue markings allows one to tell these fish apart. Most Danios stay under 2 1/2" long, although Giant Danios can get up to 4".

Rasboras
The most popular Rasbora is the Harlequin Rasbora - Rasbora heteromorpha. A very similar looking species, Rasbora espei, is also available, as is the Clown Rasbora - Rasbora kalochroma and the Scissor-Tail Rasbora - Rasbora trilineata. Orange, brown, and red are usual colors for Rasboras, and their stop-and-start swimming makes them interesting to watch as a school. Scissor-Tails can get up to 6" long and Clown Rasboras up to 4" while Harlequins stay under 2" long.

Barbs
By far the most commonly seen and commonly cursed Barb is the Tiger Barb - Capoeta tetrazona. It nips the fins of other fish if not kept in a large school of its own species and because it is over-bred it is susceptible to diseases. Several aquarium morphs are also available (such as the greenish "Mossy Barb'' and an albino variety) but these are even more sickly and often deformed.

Don't give up on the Barbs too fast though, as many are well suited as first fish, especially for those with moderate sized tanks. Capoeta titteya, the Cherry Barb, is a terrific little barb - up to 2" long and with a wonderful orange-red color.

Mid-sized barbs (up to about 4 1/2" long) include Clown Barbs - Barbodes everetti, Rosy Barbs - Puntius conchonius, and Black Ruby Barbs - Puntius nigrofasciatus. The artificial morphs (long-finned, albino, etc.) of the Rosy Barb should be avoided though, as these tend to be sickly.

Checker Barbs - Capoeta oligolepis and Spanner or T-Barbs - Barbodes lateristriga are large, peaceful barbs (Spanner Barbs up to 7" long). Unless you have a very large aquarium avoid Tinfoil Barbs - Barbodes schwanefeldi. They grow to be over a foot long!

Note that many barbs don't school as "nicely'' as do Danios or Rasboras, but most should be kept in schools nonetheless. Also note that many authors may put all of the above mentioned species in the genus Barbus.