[Pavel Chaloupka]

I agree with Ghia. Definitely no reason to be concerned about it. I think the relation between softwater and oodinium would be hard to prove. I would assume these problems are closely related with badly handled tanks and unstable conditions + the fact that people do not know the life cycle of the parasite and therefore do not understand how to treat it well. I have kept many species of different fish in soft and acidic water and I never had one single problem with velvet. On the other hand, I have seen countless cases in shops, where the fish are kept in tap.