Na you should flush on a fairly regular basis, as you fert your soil fills up with toxic salts. The salts swing the ph of your soil towards an extreme where your plant cant take up nutes very well and the salt crystals themselves stop your plant from sucking up nutes as effciently. (During veg i always tried to do it once every 2 weeks, thats overkill in my opinion but it was always so cool to see the insane growthspurts that would occur after i did it).

I say your plant is indica domninant because of how fat your leaves are, mines sativa dominant (some indy in it), just take a look at my leaves then yours, you'll see that yours are much broader/fatter looking. Yours were already fairly bushy without the LSTing, another indica trait.

And dont worry, odds are with 4 bag seed plants ATLEAST one should be male, i mean its a 50/50 chance technically for us new guys, if the growing gods smile on you and give you 4 fems just cull the weaker one(s). Theres ALWAYS a runt of the group.

Ty for the kind words on my plant, Yours are lookin nice and pretty too. (Im jealous you've got some indica dominant bagseed, bagseed tends to sway more towards sativa dominant. Well atleast according to the members of this forum it does).