should i start using nutrients? check the pics!

I started my plants from clones, i have three sour bubbles and five blue dreams. They have been growing for 2 weeks since they have been transplanted. the type of soil is foxfarm organic soil ocean forest. I was wondering if it was time to start adding some nutrients? I have organic iguana juice (3-1-3) Should i start with full strength? half? And one more thing the sour bubbles are looking a bit sad, any idea whats wrong with them?
 

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Start nutrients at 30 days as ffof has enough for 30 to 45 days. Start at 1/2 strength MAX and work up from there.
 
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