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>>Why do we put an alien substance into our Notho' tanks ? Is Velvet a problem in the wild ? I don't know.<<
Replicating, exactly, the native environment is impossible. We can only hope to mimic it. In their native habitat, Nothos do not see peat or any other artificial substrate we may offer. Nor do we buy bottled "Notho Water" from their collecting site. Therefore, we are going to altering the fishes ecology when we keep them in captivity. This would include deseases and parisites. Our local water supplies and ambient atmosphere used in our fish rooms are filled with foriegn viruses, bacteria and parasites.
I'm not an expert in the area, but I would hazard a guess that there are many strains and variations of Oodinium and other pest that attack our fishes. Why some may be more succeptable than others may be a physiological difference between species. Or it may be that the species has never been introduced to those new strains and has never had a chance to develop an immunity to them.
So I would not be too concerned over using 'artificial' mintenance methods, such as adding salt, in order to maintain species in our fishrooms. As long as the fishes' health and well being is the primary objective.