To grow kind dawg u have to know the ph its very important you cant just give them whatever you want bottled water will be somewhere around a 5.0 I belive.
Theganman yo go to stater brothers and buy some baking soda to bring up the ph about 1 tsp per gallon or so will bring up the ph quite a bit and if you have to come down use regular vinegar about 1 cap to 1 gallon, good luck
Dude the taproot has to face down or the root starts to grow upward and can cause a hermie. face that down and you have a better cahnce of getting her to be female (supposedly)
Hey bud I wouldnt even mess with it it looks fine get some air movement to start strengthening the stalks and for the other two its kinda hard to say without pics but I would say they are probly getting alitlle hott if theyre that new check your temps and get them around 75 good luck.
I know that the violator kush is 22% but I believe the one of the greenhouse strains has up to 28% and My arjans ultra haze#2 is 22.9 so you would just have to do some research I think the sativas your going to find have generally higher thc level.