Yes I read that article.
[/I]It would be interesting to see pathology comparisons between FW and SW cases.
It's a bit like the substrate and barbel erosion issue with Corydoras.[/COLOR]
I know people are quick to jump to the water quality on that subject, even if the water is fine, but I find that to be flawed. I think its just the quality of stock, genetic as they are a farmed fish. I think someone should take a poll, and see where they got the corys if they experience the erosion.
Also when serving their purpose they do, and can be dragged on substrate. If one were to think if they dragged a piece of their body across substrate you would experience scratching of the skin, possibly cuts etc etc, substrate digging, but most refuse to accept that for whatever reason.
My peppered is fine in my 20g pretty rough substrait, hes got really nice barbles quite long compared to alot I have seen, but he is about 4ish years old.
I never use fine sand and all my corys are fine. It is likely that everyday wear and tear on substrate combined with questionable water qualities leads to problems.
Experiments have been done keeping corydoras on glass fragments substrate with out issue. I've seen substrate in Venezuelan Orinoco streams that will scrape your hands and feet raw. I've seen issues come up on planetcatfish where even with beautiful sand, guys corys are suffering fin and barbel erosion.
Fixing either one will likely reduce the issue.
Wild corys in Columbia, note the not so smooth substrate.