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Does anyone know the life-span of Corydoras? I found one of my corys
dead suddenly-- and there were no marks on him, no spots or fungus
or bulging. I tested the water and there was no ammonia or nitrates--
all the other fish are active. He was fairly active; I can only think
he lived out his life-span. I'd be interested to know if there are
any other ideas of why he died so suddenly. He was large when I got
him so I don't know how old it was. Still it made me curious to know
how long I could expect to have a cory if I bought it new.