aqua_holic
Aquarium Advice FINatic
Here's one regarding tissue damage that I keep in my favorites and I'll find the other in regards to WC's. http://www.fishchannel.com/fish-health/freshwater-conditions/ich.aspx
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And here's another in regards to WC's and secondary infections. http://www.badmanstropicalfish.com/forum/index.php?topic=1285.0
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The first is just a warning, not an actual instance where it's happened. I'll file that away with all the other warnings about things that don't happen. But that's really besides the point, which was the impact of a weeks worth of nitrates on a fishs immune system. I'm certainly not going to argue that water changes are good for healing injuries and preventing secondary infections from those injuries....in general. But ich is not one of those injuries.