Purple Maroc seedlings - fine! Super Bud seedlings - yellow and burnt! Why?

[doobiesnmovies]

Hey guys,

See the pic below...

6 plants - 2x Super Bud (the two in the front-middle) 4x Purple Maroc
125w Blue Spectrum CFL, kept around 3 inches from plants.
Constant tempts of 74-78 degrees and humidity of around 50-55% RH.
Soil: John Innes Seedling soil + perlite.

I feel like everything I have done so far has been fine, so I have no idea why these two plants are going wrong - any ideas??

Any help would be hugely appreciated... thanks!

 

[mrpeoples]

some strains are more delicate and the nutes in the john innes may be too much for them.

also, they need a little more humidity that you have

 

[doobiesnmovies]

some strains are more delicate and the nutes in the john innes may be too much for them.

also, they need a little more humidity that you have

I thought it would be extremely low on nutes as it is seedling soil. You reckon I should flush it with loads of water to get rid of nutes and then maybe they might survive? Or just get rid of them?

Also, any ideas how I can get it more humid in there?

Cheers man