im going over watered,in soil you dont really wont a runoff,if you have runoff your washing all the life out the pot,a plant that small shouldnt be more than a cup of water every 4 or 5 days,here a tip that will help you more than you think,go to amazon garden and get you a moisture probe,comes with moisture ,ph,sunlight,keep the moisture level bettween 45 and 65% and your gold friend,my plants are right at 12in tall and i water them about every 7 days,if you continue to overwater,the bugs are gonna enter your life,and knat are a bitch,not to mention root rot,at the stage your at you shouldnt be adding nutrients either,that some fine black soil there and it is rich in nutrients on it own if you dig judging when to water can be confusing at times,here another tip,take same size pot your using ,fill same depth with the soil your using,take the empty pot and lean it towards you,then take your watered plant and do the same,you will feel the difrence