03-26-2009, 03:21 PM
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I've maintained several species of Corydoras over 15 years, they are certainly fascinating and interesting fish in an aquarium. A word of caution, they do not like changes and are quite sensitive to the water parameters. If this is a new tank, let it cycle fully and get biologically established before adding corys; they will have a much better chance of survival. They are very sensitive to ammonia; one of my lfs regularly receives fish direct from south america, and he tells me that the corys often arrive dead, all of them in the bags, unless they are shipped with only a few fish per bag. In the past I have lost some when introduced into newish tanks (6-8 weeks after setup) but never when the tank was established (beyond 5 months). They do not like any chemicals or salt. And a smoth substrate (preferably sand, but very small gravel will suffice).