New grow but a bump in the road.... 18 days in

Hi guys,

started these on the 26th June and i don't see much growth on all 3 of my girls and the colours are a little off (light)... i would normally see more leaves at this sage. watering when drying and is a lighter weight. The northern lights is growing really well so a little confused, i know different strains and no 2 seeds are the same....

Purchased from seed bank and "feminised"
1 x Auto cheese berry
1 x Auto OG Kush
1 x Dr Trichome cheese feast
1 x Northern lights - started 8 days ago

Ph - bottled spring water 5.8 (no nutes) - draining fine
Medium - canna pro plus
Under 2 x 600w full spectrum Led lights (16/6) as I have a mature lady and she only has a few weeks left in her.

Any suggestions please?

Cheers Guys!

This is the 2nd post I've seen recently with a preloaded coco media that has feeding issues. While I'm not sure what the fix is, I will offer a path moving forward. If you want to grow in coco, grow in coco and don't try to take shortcuts. This preloaded stuff seems to be nothing but headaches. Sorry I can't help with the problem at hand