I think they're just a little under nourished. Slight purple on stem and leaves just a little pale suggest that to me, together with general skinnyness.
Are the roots being constricted from growing out of the rockwool?
Check the roots, what do they look like?
I can't see any fan, you need a fan blowing on the stems to fatten them up.
Other than that, it must be too little light, I think.
faithlessxxx Reviewed by faithlessxxx on . 6 week old weaklings It will be 6 weeks this Thursday (Jan. 25) since the seeds cracked. I'm disappointed in the size of my plants compared with other success stories that I see online. Please look at the attached pictures and give me some idea of what I might be doing wrong. I'm a first-time grower The color of the leaves looks good The roots are great I don't know the strain of seed; got them from a friend who got them from Amsterdam. He doesn't remember the strain. Do some strains start slower than Rating: 5