Thats right,make sure that your plants dry up a bit between feedings/watering. stick your finger into the medium. if it's fairly dry 2 inches or so down, it's time to water. pick up the container and feel it's weight when it's dry a couple inches down. this will give you a reference point. when it feels that weight again, water again. it takes some practice. it's better to under water than to over-do it.