First Grow, sick bby's

Hey guys, So as some of you who've seen my previous posts might know, this is my first grow ever. So far this community has been an awesome source of information, but I am having a bit of difficulty diagnosing my plants and am sure someone here is far more knowledgeable than I! I've included pictures at the bottom of this post to help aid in diagnosis. Symptomatically they seem to most resemble plants in the early stages of nitrogen deficiencies, yet they should presumably have ample nitrogen available in their soil.

Strains-- Purple White Rhino Kush & Critical Kush
Grow Stage-- 3rd week veg
Light-- 1000 Watt Metal Halide
Nutrients-- Humboldt Oneness 5-9-4 once weekly 2.5ml/gal
Soil-- Fox Farm OF
Room Temp--70-77
Relative Humidity-- 20-25%
Room Sq Ft-- 25 LWH=(5x5x6)
Pests-- none known
Water PH- 6.8-7.2 when measuring tap water, slightly below 6.2 when measuring run-off

Problems/Observations: The plants have recently seemed to be a more vibrant green in their center, not sure if this is the beginning stages of yellowing. On some of the plants I've noticed the leaf tips curling inward and some sick unhealthy leaves closer to their bases. One one plant in particular I've noticed a bit of a white dusty accumulation only on one leaf... (this is a plant I've kept next to the humidifier in the room). I've included pictures of both the white accumulation/sick leaf and leafs that are curling inwards(in attachments) and one of my canopy at the bottom of this post. (please look at the attached thumb nails for closeups of sick plants as it is not very visible when viewing the full canopy)

Any help would be much appreciated!

They look okay to me. It is not unusual to get a few dead leave near bottom of canopy and that white stuff on the leaves by your humidifier is probably mineral content from your water if it is well water or tap water.

Bugeye said:

They look okay to me. It is not unusual to get a few dead leave near bottom of canopy and that white stuff on the leaves by your humidifier is probably mineral content from your water if it is well water or tap water.

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Hey thanks for stopping by Bugeye, I think you may have called it on the white accumulation, I am using tap water! Can this be a problem if I am not allowing it to sit for 24 hours to get to room temp/to allow chlorine evaporation? There are a few near the bottom of the canopy, but if you look closely some of the leaves at the tops of the canopies tips are starting to curl down and slightly yellow. I worry this could be the start of a problem spreading. If it is hard to see, I can attach some more pictures for you!

Estrange said:

Hey thanks for stopping by Bugeye, I think you may have called it on the white accumulation, I am using tap water! Can this be a problem if I am not allowing it to sit for 24 hours to get to room temp/to allow chlorine evaporation? There are a few near the bottom of the canopy, but if you look closely some of the leaves at the tops of the canopies tips are starting to curl down and slightly yellow. I worry this could be the start of a problem spreading. If it is hard to see, I can attach some more pictures for you!

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Yes, pics of your top leaves having issues would be good to see. I'm not sure about issues with running tap water through humidifiers. Probably not great for the humidifier but I have never heard about issues with plants. I would move it further away from your plants so they aren't collecting as much stuff on their leaves.