Help! Is this light burn or nute burn?? Pics included

Hey guys,
I have a problem with my plants. It has been present since I began, but now it is getting worse.

I assumed it was light burn since i'm running these pretty small plants under a 1000 watt mh. However, I noticed it has gotten worse even though I raised the light about a foot higher than it originally was. For about a week it was only present on 3 of the 10 plants i'm growing, but now all of them have it. My temperatures at canopy are right around 80* with lights on. The light is about 2.5' above them.

For nutes, i'm running floranova bloom only (lucas formula), at 700 ppms including 175ppm tap water. I flood the trays 3 times a day for 8 minutes each.


What does this look like to you guys? I have RO water present, so i'm thinking of pouring some in the rez's.

nute burn, it may be that they dont like the amount your giving them, try giving half

that is 100% nute burn my friend...

Definately nute burn man...poor lil babies....

yep definately need to either place less nutrient solution in your mix, trying adding less like half and see if it does anything. You are going to have to empty your res and start fresh otherwise those plants are going to burn till they fall dead

Haha thanks guys, that's exactly what I needed to know.


For some reason I had thought they could handle 700 ppms.

Anyways, is it necessary I flush them at this point or can I just dilute it to around 400 or so ppm? They are still growing, so I was kind of thinking a flush woulnd't be required.

My plants have the same deal but is way less serious,its only on the very tips of the bottom leaves. Should I worry?