Crispy ends, some pale leaves, weird: any thoughts?

Well I've been thinking it was over flowering nutrients because I was a little heavy, mixed with led light burn and heat stress. but it's all in weird areas not just on top. also the other 2 plants that are legit right beside the other 2 are fine. all 4 dif strains, 1000w led, 20 days into flower, fox farm soil, grotek flower nuits, light is 20+ inchs away. I always check ph level. have been watering when they dry but has been coming out to around every 4 days. buds are nice and green just leads look unhappy on some. any thoughts or suggestions I'm open ears. Thanks brothers and sisters!
 

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some more pics
 

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Looks like your tips are burnt from too many nutes. Check out the second post down for a great explanation on nute burn.

 
Thanks @BigD13 that's what I was thinkin I'm using 0-6-4 flowering but only used a small amount each time. but I did do it 3 times ina row because I thought the amount was so low. but I've now ran 2 feeding of just Ph'd water and will prob do another one until there looking healthy agian. you kinda see how there pale in some pics ? like light yellow ? any thoughts ?
 
I grow outside, so I’m not real familiar with plant problems grown under lights. I have noticed though that some people seem to have cal/mag issues with inside growing. You might want to do some research on that. Also, if your using 0-6-4, the plants isn’t getting any N, which may be contributing to your yellowing.
 
persision bloom, I kno that's a 3 step but I just needed a flower nuit because I have a fish plus from grotek for veg. i dont think low nitrogen is my prob cuz I'm in flower and some leaves are dark green but I add a little here n there just to be sure. the fish plus is 5-1-1 and the bloom is 0-6-4 which I thought would be perfect for both. fish for veg and bloom for flower. I really think I fed to much bloom. but the yellowing is weird. I'm all ear thanks everyone @oldsmokey
 
I used about a quarter cap worth not even, to about 2000ml of PhD water. plants are in 6.5 gallon pales. but i fed the bloom 3 times ina row so the last 2 feeds have been straight water so I'm just waiting to see results @oldsmokey
 
I think you may have just answered your own question. You are using one part of a three-part base nutrient system. Along with that people will use additives in the flowering stage. You need to get the other two parts of the base nutrients.then go to grotek website and follow their feeding schedule the manufacturer knows best how to use thetey product.
 
I think you may have just answered your own question. You are using one part of a three-part base nutrient system. Along with that people will use additives in the flowering stage. You need to get the other two parts of the base nutrients.then go to grotek website and follow their feeding schedule the manufacturer knows best how to use our product.

I agree with @oldsmokey. Also, generally speaking, cannabis likes a N-P-K ratio of 2-1-3. That’s one of the reasons I use Mega Crop. It’s pretty close to that ratio, plus it’s a one part dry nute that’s measured by weight. Super easy to use & a lot of folks here use it.
 
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