Planted Tank Guru
Join Date: Dec 2017
Location: Elk Grove, California
Actually, OP, not a myth, I would refer to expert opinion from those who raise, breed, and study corydoras exclusively on corydorasworld on Facebook. You will find many notable ichthyologists, like Ian Fuller, on this site who specialize in corydoras research from all over the world.
One persons experience, as we all know, is not enough to classify anything as a "myth," you need to refer to specialists that have studied something long-term in order to make a decision an objective one. This is where I found information when I was researching the same question several years ago.
But, then again, you may not be keeping corydoras at all-- in which case this question is not of interest to you.
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