Drooping leaves & burnt tips

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As you can see in this pic, the leaves are kinda drooping, it's not on all plants yet, but would like to fix the problem before it gets worst. Also I'm getting burnt leaf tips as well. If you look at the lower right side of the plant you will be able to see it. I've never done auto's before, This is my first auto grow. Would you please help me fix this problem. These plants are 49 days old and I use Hydro-Bloom, hydro-guard, Armor Si. I have doubts about TDS meters. With that being said, The TDS meter shows around 850 PPM's. I'm not sure what it should be at. Thanks for anything and everything you can tell me.
 

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Looks like over or under watering to me. Cant see the burnt tips but I feed till the tips start to burn then back off the N a little just to make sure that it doesn't get worse
 
Looks like over or under watering to me. Cant see the burnt tips but I feed till the tips start to burn then back off the N a little just to make sure that it doesn't get worse
Thanks for the reply. I'm using DWC system. Sorry I should have put that in my first post. That's why I was asking what the PPM's should be at. Right now mine are at 850. Is there a feeding chart that I can look at on this site? Thanks again for the reply
 
Auto's are (usually) a lot more sensitive to nutrients than their photo counterparts. For me, I look at the manufacturer's recommended amount and take 3/4 of that. That is then my 'max/full strength' strength nutrients. Usually just stick to 1/2 of that though, unless they seem a little hungry. There's lots of information regarding nutrients and auto flowering plants on here and on other sites too. Good luck!
 
Is there any chance they just came out of a dark period? in this pic.
 
That's what I was going to say. Are they just coming out of dark period? And also she doesn't look like shes even in pre-flower yet is she? I grow in coco and use AN so I am unsure of your PPM question
 
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