Glass tank
Use a 10%-30% bleach to water mixture and wash it out really good after your done. Make sure you use a bit extra of the dechlor water conditioner before you add fish, but I would cycle the tank before adding more fish.
Acrylic Tanks
You can use bleach, but its not recommended. I would use a much lower water to bleach ratio if you do it.
LOL I totally read that wrong... yes you do not want to put bleach in it with fish. With a title like "Cleaning tank" I thought you wanted to clean the actual tank, not treat the fish. srry I REALLY hope you didn't dose your tank with bleach.
Ich meds depend on the contents of the tank. Copper is more dangerous to sensitive fish than salt, IME (both will kill inverts however, so be sure to take any snails, etc out before treatment).
they'll be fine. I've used salt treatment with Blue rams, catfish(scaleless), loaches(scaleless), guppy fry, and several types of shrimp. Swordtails are very hardy; they'll be fine.