Are corydoras hard or soft water?

In nature they are (very) soft water fishes. Most of the ones you buy are tank raised and raised in whatever water - but some of the rare sort are wild caught (and oddly enough pygmy are often wild caught). Wild caught fishes might have a harder time adjusting to moderately hard water but in most cases it can be done. There are many species of cory and some of them are more fragile than others.

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