Looks like too much N and a cal/mag issue stating..I would hold of on any N stuff for a min ..what is you soil PH?..I would let tehm get nice and dry then give some GM Jumpstart or root stim..and also anything with myco in it..also foliar some cal/mag .Small pots are not that simple to keep up with,,,they dry out faster as roots fill them in and consume the goods in the soil .