Your plants looks fine (even the one thats leaning).. however, I would recommend that no more nuts are used yet - the root system on these plants is not established enough - whatever nutrients they need, they will get from the soil.. which leads me to my question - what soil have you used? Looks a bit peaty to me.

Cannabis plants require a very light airy medium - and it doesn't look as if you have any perlite or vermiculite in there, which helps drainage and root devlopment.

Hope all goes well though! :thumbsup: