Multiple Problems

Light: 240W QB Dimmed to approximately 60%
Light Spacing: 20"
Light Cycle: 24 hours
Temp: 75-82F
Humidity: 40-65%
Watering Method: Ebb and Flow
Watering Frequency: 1/24 hours
EC: 1.0
pH: 5.8-6.0
Growing Medium: HydroFlakes Plus (fytocell)
Age: 4.5 Weeks

This is my first grow and I've almost killed them several times. The seedlings emerged from the rockwool on 12/16/2020. They're all stunted but they're photos and I plan on using them as mothers. I recently raised the EC to 1.0 from 0.5. I suspect that they're just hungry and I need to increase the EC more. Does anyone have any suggestions?

something is definately wrong i hope you get it sorted out they should be much bigger after this long check the roots on the little 1

Overfed??? Why are you doing ebb and flow for those guys - hand watering daily should do the trick. If that medium holds any water, you might not need to water for days....

The medium does hold some water. I'll turn the pump off until the medium dries and the plants start drinking more. Thanks for the suggestion.