this is my first indoor grow i have a flood and drain system with a 400watt mh light i have a tri meter set to the correct ec ph and temp as instructed by dnf but my babys dont seem to be growing upwards. I have a feeling that i didnt allow them to root long enough befor moving them to their 4" rockwell cubes

the ec is set to 2000
the ph level is 6.1
the temp is 68
the light is about 1.5 ft above the tops

still no growth upwards any help would be great.