Lots of progress on the nodes, on all plants. Laszlo's and Nadja's strains are definitely quicker than Colin's and Nandor's to grow at the nodes, though Colin and Nandor get more height/stretch before they grow at the nodes.
Laszlo's got some concerning spotting on his larger leaves that I'm hoping the addition of calcium & magnesium solution to the water helps with. Colin and Nandor have some yellowing at the base of their leaves which may be Iron deficiency, which should also be corrected with the cal-mag solution (which also contains iron).