In the future just use the soil right from the package and don't wash it out. The soil was balanced to feed the kids for approx. 20 - 30 days and after they throw 5 leafs per - begin feeding.
Right now - feed with full strength veg nute with a root booster and then cut back to 50% till 5 leaf clusters. Find an organic tea or living bio to reintroduce the "living" things back into your soil.
You washed out the nutrition and living bio's from the from the soil.