Corydoras acting weird

[the loach]

If you remove all fish out of the main tank for at least 60 hours there is no need to treat it with anything.

 

[FreshyFresh]

What if it's 59.5 hours? Kidding..

I understand that certain phases of the ich parasite need a host fairly quickly, but I was not aware of any stage of it that will die off completely in under 3 days of no host.