Temp and salt works for most it seems, but if your like me (Heavily planted tank with inverts) many medicines will kill the inverts/plants. I was able to pull the inverts out and into another 'clean' 12 gallon tank.
And salt is not good for many plants in a planted tank.
So, if you have plants/inverts, cross-referance the chemicals in whatever medicine you use to not obliterate your shrimp/snails/and plants!