Zinc deficiency?

I am growing White Berry and Hindu KushxSkunk no.1 x Skunk no.1 in a Black Label Total Mix (I usually go for a light one, but c'est la vie!) under a 400 W MH. They are 18 days old and they were fed only 2 times, half a dose of Bio Grow at first and 1ml FishMix and 2ml BioGrow the second time around.

White Berry


Hindu KushxSkunk 1 X Skunk 1
bushidobrown-320283-albums-wberry-picture2096932-hindu-kushxskunk-no-1-x.jpg



The whole process started in day 13 or so, but hasn't really progressed.The discoloration only seems to be going on the first couple sets of leafs. Other than that, they look well I would say.








At the begging they were under a 18/6 schedule but something went wrong with the light setup and for 2 days they shared room light. After that I put them under 24/0 and my guess is that is what triggered the defficiency. They suddenly starting growing 1 node/day and took all stored minerals from the lower leafs to accomodate new growth. Could this be it? This is my first indoor grow and I don't really recongnize what they want me to do. Tried looking over the charts I found on the internet and they turned out to be no good lol. I had a different diagnosis every day :)
So, I am in search of advice from the pros.
 
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