Grow Mediums newbie 1st grow

[bud enthusiasts]

uh oh, getting down to the nitty gritty and have some yellowing going on.
Normal? not normal?
problem?
deficiency of some sort?
excessive something or another?

Right here at week 10 from sprouting so we're close to the end
suggestions please, we are due for a nute change, was thinking it's about time to start flushing'em?

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the big bud/northern light is finally budded out and is a tree!
it is approaching 6ft in height!!!
actually this could be the amnesia plant after reading the descriptions again.
But I never thought autos got this big. Had to add a couple CFL to get lights on some parts of it. Once the others come down I can rearrange for more of the HPS onto it.
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I'm no expert at autos but when doing photos you get some yellowing at the end of the plants life I would start flushing plain ro is all I do for 1 week.

if you get yellowing in weeks 7-9 in a 10 week stran don't be shy on the cal- mag

Plus if u get a microscope u can look at the trichome( spelling) and if a good majority like 70% or so are milky white the plants. Are done and helps against international invasions
Mites lol