I bred Colisa Lalia in the early 90's and after a few generations where I destroyed every fish that look the slightest affected.
Was able to reach the point where there was no sign of Iridovirus for many years in my setups.
That made me conclude that the fish are not born with the disease but where catching it very early on.
So by doing insane water changes, bringing all fry to other clean tanks removing all adults asap, I ended with a clean setup. And bred them for more than 10 years afterward.
At the moment I didn't realize how lucky I was... I simply dismantled and gave everything when we moved from this house. Moving this was impossible. And I still miss them dearly today.
Was able to reach the point where there was no sign of Iridovirus for many years in my setups.
That made me conclude that the fish are not born with the disease but where catching it very early on.
So by doing insane water changes, bringing all fry to other clean tanks removing all adults asap, I ended with a clean setup. And bred them for more than 10 years afterward.
At the moment I didn't realize how lucky I was... I simply dismantled and gave everything when we moved from this house. Moving this was impossible. And I still miss them dearly today.