Should I be concerned about the deficiency in these first leaves they are both on the very first set of leaves all others look fine ? Plants will be 4 weeks come Monday . First time trying to grow a wee bit for myself 

Hopefully it is something as simple as that , the structures all above the first set seem fine and nice colour ect ...looks more like physical damage to me, rubbing against the container maybe
Sorry mate a friend gave me them , I can't remember promised me they were good though lolwhat genetics are you using where did you get them
Just on the first set of leaves in the picture , one is a little yellow looking at the tip and one has what looks like a little puncture hole in it .What deficiency?
Just on the first set of leaves in the picture , one is a little yellow looking at the tip and one has what looks like a little puncture hole in it .
Heed this advice. The number 1 cause of plants dying is overwatering. That includes vegetables and houseplants.Plants are not going to be perfect. They'll have blemishes, marks, etc... Those plants are fine. Slow down on the watering though. When you get algae growing on the perlite you're keeping them too wet.
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Thanks very much for the tip much appreciated, they in five litre pots and I'm feeding them 1.75 litre of water with my feed every 3 days . Could I just give them half one day then half the next day or will I cut the amount of water ? Sorry I'm a total novice to this ...Plants are not going to be perfect. They'll have blemishes, marks, etc... Those plants are fine. Slow down on the watering though. When you get algae growing on the perlite you're keeping them too wet.
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Thanks , much appreciatedHeed this advice. The number 1 cause of plants dying is overwatering. That includes vegetables and houseplants.
Learn to feed them when the medium is dry, rather than on a fixed time schedule. This is an important step to learn when first starting out.Thanks very much for the tip much appreciated, they in five litre pots and I'm feeding them 1.75 litre of water with my feed every 3 days . Could I just give them half one day then half the next day or will I cut the amount of water ? Sorry I'm a total novice to this ...
Thanks dude have a look in the morning