Spots on leaves?

[sspitfire]

Hi. I noticed some purplish spots on two of the leaves on a plant. I searched for some info but I'd like to get your opinion as well. The plant is 10th day from flowering (12/12 lights, CFL) Soil is a mix from a flower shop. I havent put any nutrients so far. I reckon temperature and light are ok b/c so far I havent got such problems. I water them every 3 days. pls take a look and tell me what do you think. Also on the second picture there's a plant which I think is male but maybe its too early to tell - 10th day of flowering?
PS. If i missed any details - just tell me.

 

[ibTheMan]

You need to add K, earth juice makes stuff called Meta-K, good stuff, cheap, and will fix your prob.
Also thats a male plant 100%

 

[Seamaiden]

I agree with TheMan. It's a K problem, and that's most assuredly a male plant.

 

[Dr. Detroit]

No point in feeding the condemned. Uproot that male.