Leaf curl under is a symptom of over fertilization lots of times. Maybe cut back to 1/2 strength and see if they look better. You can flush with water. You need to drill lots of drainage holes in buckets. They don't like standing in water. Looking good. Have fun.
LolaGal Reviewed by LolaGal on . Leaves Curling in soil S= Soil E-indoor E-soil E-specific medium (not sure of the brand) SCL-Added nothing to the soil SCLR-Unknown E-Water source(TAP) E-Source water pH (7.0) Rating: 5