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yellowing of the lower leaves is not normal at 3 weeks into flowering.

I'll second the Calmag and a good flush if you havent done so in a while

add some veg nutes to your flower nutes for next couple of feeds

looks more like overwatering, super saturted root zone than N toxicity. N toxicity you will usually have very dark green foliage first

well the premature yellowing is a sign they are hungry. since you dont want to use nutes, I cant help u. organic nutes at this point will take awhile to take affect. so what's some diminished yield.

looking like overwatering or an mg problem

that soil is probably too 'hot' with nutes, compounded by overwatering. u have proper drainage for runoff in thos cups?

looking like a worsening Mg deficiency. may also be K as well. epsom salts for Mg works.

really need to see the pics, but sounds like premature yellowing due to the cutting out of veg nutes too early.

in this link if you scroll down there are quite a few cloning methods in case you need it. http://cannabis.com/growing/

the Hydroton clay pellets actually hold a fair amount of water, air and nutes in the very corrogated pores on the surface of the balls.

u can cuck em now or wait a bit to make sure. you can take clippings basically whenever the plant is mature enough which with preflowers now would be good. personally i do first week of flower

used primarliy for drip, ebb and flow and dwc.

what are they supposed to do when they get 12 hours or so of light? veg?

those look like male preflowers

good rule of thumb is to start very light nutes when the cotyledons beging yellowing-these leaves are their primary food source for first couple weeks of life similar to an egg sac that surrounds the yolk

they look pretty good. becareful about overwatering. good rule of thumb is to start very light nutes when the cotyledons beging yellowing-these leaves are their primary food source for first couple weeks of life similar to an egg sac that surrounds the yolk

and 5.3 IMO is on the low side. you want to be around 5.8. running at 5.3 u will experience some slight lockout.

the small white hairs emerging from the main taproot(s) are feeder hairs. they are very fragile. yes they look exactly like mold all white and fuzzy but not very likely is mold. yes they will disolve literally in your hands. once the plant matures a bit, they will not look like this again.

I agree with the overwatering analysis. from the pics, the plants look very healthy and happy besides the overwatering. I would be concerned however that after a month of flowering, there are not more pistals and bud sites, however that can be attributed to their young age put into flowering...