Northern Hemisphere Duckies

Its been roughly 28 days since I Germinated them. Ducksfoot leaf structure is now evident on all new leaves. The Back Left plant is showing off what the ducksfoot structure looks like. There is a slight odour but wouldn't alert anyone - Keen smokers will know, if cannabis is being grown anywhere near you you can detect it from a mile off. I almost get a minty odour and you really have to get in between the leaves to detect it. They've been watered and fed some Biobizz Fish-mix today. Due some high temperatures and sunshine over the next few days. I'll update after the weekend - I'm hoping to see an improvement in growth between now and my next watering/feeding. **UPDATE* Plants are starting to grow more leaves now. Judging by the roots poking out from the bottom of my fabric pots they've been focusing on root growth and now are starting to put that to use. I'm excited to see them really explode. No real change on the stunted plant. I'm suspecting it could be either PH imbalance or overwatering issue. I had considered a magnesium deficiency but the yellowing is incredibly mild. Anyone any insight?? Plants did not react adversely to Biobizz FishMix, I will bump up to 2ml/ltr. I fear I have jumped the gun on watering to runoff, so I'll be more sparing next time. It hasn't been that dry or hot lately and the pots are taking forever to dry out again.