
-- a side note: HM is out for a while,... and I merged the two threads, no need for both...
Firstly, calm down mate, there's nothing to get squirrely about going on here,... If you are new to all this, topping isn't a wise thing to do with auto's, until you have better grow skills dialed in; remember, they don't have much time in veg' before bloom kicks in, and growth slows way down, especially on Indica dom. strains like these... Topping sets them back some, and if improved yield is your goal here, this topping on plants not big and branchy enough yet won't improve this.... at 3 weeks, veg is pretty much over and they won't be stacking nodes up very much from here, hence the slow-down in part here,... fewer nodes, fewer buds! As you see, one topping didn't work anyway... don't get down on yourself mate, this is an advanced skill, and the plant has to be a good candidate for it matched with excellent grow skills during veg!
What soil brand is this? It's richness determines in part when and how much feeds they get,...
>> too strong in concentration to start off with, hence the minor tip curling, likely from too much N, and the bit of tip burn-- all minor fortunately! ... am I reading this right, you last watered Feb. 8th? -it's been two weeks? This is why 5gal pots aren't the best choice until you know you can get plants big enough to really fill them out,... they take too long to dry out, and you can't feed regularly at milder dosages which tends to work better,... they can dry out unevenly too, wet bottoms, drier tops zone, so you end up guessing on water, using small amounts, and this can start creating dry patches... best way to tell is to heft the pots and get a feel for the weight when well watered and when dry enough to water again,...
>> so, pending what soil this is, diluting your nutes down more is needed regardless, how much depends on the soil brand and it's richness level,... if you can, get a soil pH probe, like the Accurate 8; avoid the cheapo skinny probes seen at garden ceters, etc., they are lousy for accuracy,...