I have shrimp( amanos and RCS) purchased from a pet store and they were kept with fish being treated for ICH. Shrimp are fine and have been in my QT tank for 8 days. I know shrimp are not a host to the ich and I did not pour the pet store water into my tank. How long can the ick live without a host and when would you introduce the shrimp into my 50 G planted/ fish tank?