Well yeah, you can water every 3-4 days but it all depends on how much water your giving it. The size of the plant and other factors. At this time your plant should not be getting that much water. They're young. way too young for you to be doing that, half the dosage of water or cut it by 25% but increase the watering time, instead of every 3 days do it every 2. Change it up already, next is your medium next time should not be miracle grow organic. Get peat moss or something else. Or get fox farm, go to a hydroponics store and ask them about Fox farm nute's. The ph meter you can get at a hydroponics store as well. Your welcome. Happy growing.