So I went ahead & bought the hydrohut mini. I started using some bag seeds that I had while waiting for my original blueberry & god bud seeds. (those came in too) so now i have a total of 13 seedling in the hut & i THINK they're doing ok. (11) regular bag seeds & (2) of the feminized seeds that came in. I'm growing from start to finish using rockwoll. I have a 400w metal halide in there now 24hrs. I have a switchable ballast, so i'll be switching to a 400w hps for flowering. I have a 172 cfm exaust fan hooked up to a can fan carbon filter. i dont have an intake fan but i have (2) 6' fans blowing fresh air on the plants. I just planted them last week (2/15) & I already transferred them into the larger rockwoll cubes. Today i started watering with 1/4 strength nutrients (dnf gro A&B) and bcuz growth (1/4 strength). My temps range between 71-85 and humidity ranges between 20-40%.

I notice that 2 of the stems are green & the rest of the stems are a dark color but all of the leaves look green & pretty healthy. what color should the stems be & what does this mean?