I had a group of tetra in my QT tank, and they have all died.
Initially they were dying mysteriously, then I added salt to combat ich and they died much faster
As I do not know the initial cause of death, I would like to do my best to sterilize the QT before I add a new group of fish.
The tank has substrate, plants, and snails which I would like to preserve if at all possible, but I am willing to discard all of it if necessary.
I had thought that if I were to do a massive water change, put in a new filter and let the tank run with no new inhabitants for two or three weeks that I might be OK as there would be nothing to host any disease that came in with the last fish.
If that is not enough I have read the Hydrogen Peroxide will do a good job of sterilization, but will most likely kill the snails.
As a last resort I can pitch the substrate, snails, and plants and scrub the tank out with bleach before setting it up again.
I would like some opinions from the community on how best to deal with this solution.