What's wrong with my ladies?

My plant is in a DWC bubbler bucket with hydroton clay pellets. Its under 2 400w HPS light(2 lights in 1 reflector) and is 4 weeks into flowering. Im feeding it Miracle Grow big bloom ferts and was feeding once every about 10 days cause my girl drinks about 3/4 of a gallon out of the bucket every day. one thirsty girl huh. the past 3 waterings i water with the flowering nutes on accident so instead of every 10 days she got 3 doses in 6 days. my question is whats happening to the leaves and how can i fix em. They started curling under bout a week ago and developed brown spots on them. The leaf tips are browning too. I checked online and i think its over feeding but i just want a more professional opinion cause this is only my 2nd grow. I posted pics below sry bout the pics but i only have a so so digital camera and im certainly no photographer. Any advice and help would be greatly appreciated thank you.

flush them with clean water. run straight water until they regain themselves. i'd make sure my light was nice and high because i find my plants get sun burnt a lot easier when over fed.

they don't look TO bad, but they are burnt. they should make it.

thank you i just took out 4/5ths of the water in the dwc bucket and replaced it with ph adjusted spring water. heres to hoping cause i stopped counting the bud sites on this on after i reached 60

How is your humidity? Also you need to actually check your ph level to determine if the actually need a ph adjustment. Pics are pretty hard to see the problem but it kind of seems like it is a heat issue in a super dry area.

The ph was 6.5 so i added phospouric acid to drop it down to 5.5. The humidity i dont know whats it at. but it is a bit dry up there. Also the plants did get within 13 inches of my dual 400w HPS bulbs so that could have definitely been a factor

Your 400s should be at around 13"

i would put em at 13" but im using the growzilla dual bulb hood so i got 2 400's side by side

rhenderson said:

Any advice and help would be greatly appreciated thank you.

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I'd say that was definitely over-fertilisation, back off your nutrient doseages and watch your ph and ec.