Wat could this be

[Guest]

Not sure wat this is from could it be to much nutes

[Bikerstonrr]

Don't know exactly what the problem is, coulod be a couple of things. Ph would be the first thing I would check. Here's a site that has more information. http://www.growweedeasy.com/cannabis-symptoms-pictures

[DW2]

Howdy Madmalay, Looks a little like light bleaching to me. What kind of lights are you using and how close are they?

[Guest]

Just mh 400 watt probly 30 cms away from the top

[Guest]

Few more pics

[Guest]

Ph. Bewtween 6.3 6.8 wen water

[OzBud]

Nute burn is generally right at the tips of the leaves.
I would generally associate yellow in the middle of the leaves like that with pH. I had a bit of something similar to that at the start of my grow this time, I think mine was a bit of a combination of pH problem when they were young and I wasn't watering to runoff yet so I couldn't check the runoff pH to see what was going on at the root zone on top of a little heat stress as well.

Also 30 cm is the closest you should be with your light, you could try raising it to 35cm for a couple of days and see if it makes a difference

[OzBud]

Those leaves may get worse but as long as it doesn't continue spreading it shouldn't be a major issue. Just cut them off when you know it's no longer spreading or the leaves get too bad.

Is that your original plant in soil, or is that something else in coco? Coco pH should be between 5.5-6.5

[Guest]

Nah its another plant in soil will flush and raise light