Yes the are absolutely salvageable. You're just over-watering them, that's all. Let the medium dry out between waterings and your plants will be happy again. In order to determine if your plants need water, stick your finger into the top of the soil about an inch down. It should be bone dry before giving the plant water again. Also, you can lift the grow pot to get an idea of the weight. Lift daily so you can feel it get lighter and lighter as the days go on. With a little bit of practice you will gain the experience.