Help diagnosing my ailing plant???

I'm inexperienced in growing, and struggling to diagnose my poor sick plant

It started out with the yellowing lower leaves about 2 weeks ago, and has just developed the red on the leaves in the last couple of days.

I assumed nitro deficiency (even though it's well into flowering), but added nitrogen doesn't seem to be helping and doesn't really explain the redness.

She's a Hawaiian Snow, 6 weeks into flowering - a slow flowerer though compared to my other plant, I'm expecting a 12 week flowering cycle.
Any feedback much appreciated!

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what kind of nutes u using? looks like a nitrogen and possible phosphorus deficiency. any well balance liquid fertilizer should do the trick. GL

nitro and phos fosho!

Po boy said:

what kind of nutes u using? looks like a nitrogen and possible phosphorus deficiency. any well balance liquid fertilizer should do the trick. GL

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Cheers for the feedback guys! I have been giving her 5mLs of each of these, about twice a week. I figured that I didn't wanna overdo it and this would be enough, but apparently not!

This is my second grow, I didn't have this problem the first time round. I think the difference is that I got crappy soil this time without slow release nutes. Also had a few weeds in it at the start, pretty hori