I just followed the directions on it to be honest. Clown loaches are sensative when you first get them, but after you get them healthy they can be rather hardy. For example, in the spring I was without power for 5 days due to a tornado, my tank was at/below 62F (lowest that my thermostat would go) and when I finally got back power all 5 of my clowns were just fine. Little stressed out and hungry (I didn't feed while there was no power) but just fine.
I've had Ich a few times over the years - usually with new pickups. Bump up the temp, add an air stone or two and add salt and it will be gone before you know it.