Toxicity or Deficiency?

I might have pushed this off to long, so my ladies need help lol. I am growing in Pro-Mix HP (peat based medium) & heard that if I use tap water I shouldn't have calcium deficiencies. I have 2 set's of plant's, a couple under CFL's & a couple under T12's. I thought at first this was a calcium/magnesium deficiency, but the issue is the plant's under the CFL's that are way bigger, show only a slight brown edging on the bottom 2 leaves only. I figured the smaller plant's would use less nutrients which is why I think it might be a phosphorus/potassium toxicity. I did start at a quarter of the dose on the bottle at first & worked up to now a full dose at transition into bloom. Also, only the big plant's have the odd claw action but most leaves are fine & all plant's have some leaf tips browning very slightly and not increasing in size. Here are the pictures, the first 4 are the T12 plant's & the last 5 are the CFL's. Thanks in advance.

they look fine but yes slight N toxicity give them some plain tap water with runoff next watering, dial back the nutes a bit, especially nitrogen once you get into bloom.

testing soil Ph @ all?

Couch_Lock said:

testing soil Ph @ all?

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Ya I do test my PH but I don't have an electric one yet. Bit hard to tell exact PH but I aim for around 5.8-6.2 I heard is best.

pulpoinspace said:

they look fine but yes slight N toxicity give them some plain tap water with runoff next watering, dial back the nutes a bit, especially nitrogen once you get into bloom.

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I felt that too a bit because of the dark green, but I was expecting more claws. Cheers

toxicity. leaves are dark, tips burnt. toxicity will lead to nutrient lock out indicating deficiencies. had that issue last grow but i purposely overfed by following the bottled instructions. i have plnts just like that leaves are super dark probably darker then yours and yet they curled but the curl went bck to normal. if you look at the previous 3 days you can literally see the curling but if i show you the same leaves the curls are gone.

only way i plan to combat mine is by lowering the dosage. i could water, feed, water. but im testing out a full feeding schedule and as a last resort if it gets super bad that is what i will resort to is a water/feed alternate schedule. your plants look like sativa's though i read sativa's don't feed as much so they may require less nutrients compared to indica's.

my plants increase in size daily and you can see it for yourself. in the past they didn't increase in size this rapidly with nitrogen toxicity. i still am working out kinks but i really have no set schedule as i base my feedings on reading the plants and making my own feed schedules for experimental purposes. like i said i will stick to a 1/8th schedule but i don't alaways stick to my word as they might look fine now but tomorrow when it comes to feeding they could look worse.