ROCKWOOL, hand watering, ph and ppm problems

Plants are Almost 3 weeks. I didn’t feed them anything but purify water. For the last week I’ve Ben feeding Clonex solution at 250ppm ( start at 200)... today I did a run off test water was exactly 130ppm in both cubes and 6ph.... So my plants eat 120ppm sense yesterday or is it getting absorbed by Rockwool ?? Do I need to feed more then 250 ppm ?? Because my ppm drops fast ?? Strange to me that both plants take same amount and one is larger then the other... the large one today started to pray also ( leaves pointed up ) looks healthy, looks hungry

You got some problems somewhere if they are that small at 3 weeks old...what color are the cotyledons? The little leaves under those fan leaves? If yellow, the plant needs more food. How soaked are the cubes?

i just started feeding them. I probably waited too long. I lost power after germination, I couldn’t give them any light for 4 days. there two 1/2 weeks today. 300ppm 5.5ph i give only 40ml a day for there size. I can pick the cube up and little water comes out

That would explain the small size....I would try getting the PH in the 5.8 area.

Will do thanks man