The Corydoras group of catfish are well known amongst fish keepers and are an excellent fish for the community aquarium. These are peaceful, relatively robust fish with loads of character, and there are many varieties to choose from.
Providing the water is well filtered and regularly changed, and the fish are kept in groups, any fish keeper should be able to keep these little scavenging fish successfully.
Corydoras are from the Callichthyidae family of armoured catfishes, having a hard, armoured body. The name 'Corydoras' actually comes from the Greek for helmet (kory) and skin (doras)
The Corydoras genus contains over 180 species, with hundreds more unclassified specimens which are assigned 'C numbers'. In addition to this, there are also variants of many species, which are sometimes a matter of debate as to whether they are different species, or just geographical variations. Corydoras range in size from 2.5cm (1 Inch) to 12cm (5 Inches), with most reaching between 4-8cm.
Whilst various species crop up for sale regularly, it is usually fairly common specimens from about 20-30 different species which are seen for sale in the trade. Beware of any very bright colours on Corydoras, since they have in the past been a victim of the cruel practice of 'dying' by injection or other method.