is this a nute deficiency, or does it have to do with humidity and temp?

so first off sorry for the long post, this is my second grow, and it's going far better than my first grow, but I'm having a few strange issues that i haven't experienced yet so any help would be greatly appreciated.
so my first problem is that the newer growth is having yellowing tipps and the edges are folding inward, and the newish fully formed leaves start to canoe upwards.
my second problem is that one of the plants new growth has a slight pinkish purple color along the main vein of the blade, and the stems range from purple to green.
my third problem is that there's a couple random holes in some of the lower leaves and ive found like 3 or 4 little brown dead spots, but there isnt very many but I can't find any signs of pests at all!
fourth problem, I topped 3 out of 4 of my plants and one of them looks crazy, it has a bunch of weird new growth and the leaves that were below the node I topped somehow developed a few little holes.
I'm using fox farm ocean forest in 5 gallon smart pots and they're on the 6th week from germination. I have a 250w hps about 20 inches from the canopy of the topped plants, with a viparspectra led for side lighting , and the untoped plant is about 18 inches below another viparspectra led. The temp in the tent stays around 75 and the leaf temp stays at 70 and they drop to about 60°f at night. I have a humidity gauge and a humidifier but I'm not sure the gauge is working correctly because it usually reads around 30-45% but condensation builds up on the leaves and dries leaving white spots.
Again I'm really sorry for the long post,thank you:)


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Did you spill chemicals on the leaf? Them holes may be from chemical spilled on the leaf. 60% for a night time temp I think is a bit low. 65 is the lowest I go.
 
Did you spill chemicals on the leaf? Them holes may be from chemical spilled on the leaf. 60% for a night time temp I think is a bit low. 65 is the lowest I go.
I may have, and I live in a cold area, so I leave my window open because it helps keep temps cool during the day, but i guess i should start closing it at night
 
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