Hello , and welcome aboard the weed train , great job so far !! Liz if you can get yourself a ph meter and a ppm meter (pen )these 2 items are a must have , Amazon has them for about $25 bucks each .the heavy purpling of the stems and branches tells me that the ph is off .what kind of seed or clones are they and what are you growing them in.( soil I suspect )how do you know what sex they are as the plants in the cups are way to young to show their sex yet and the others I am not sure if they are even old enough to show their sex , or were you told what sex they were when you got them ? Just a heads up your are gonna need a lot stronger light and a tent in the near future (4x4x7 tent works great if you want to grow 4 plant ), they will need 12 hrs of total darkness for the flowing period and almost double in height size when done flowering even with topping and training .ps I am from Ontario also , done about a dozen grows but I am glad to see you have Iceman and Emilya on board , as they have great knowledge and solid advice , good luck !!!