Heya Green2Gold,
What is the pH of the water going in the pots? First we should make sure the pH is between 5.5-6 for soil/hydro and 6-7 for soil grows before determining deficiencies. Are you adding nutrients to the 100ppm water as well or just feeding at 100ppm right now? 100ppm would be a little low in my opinion for plants that size.
Cheers,