yellow top?

[smallstar]

About 48 hours ago the top of my plant started getting a bit off colored, I'm not sure if this is new growth under the LED looking odd, or if there is a problem with my nutrients. The rest of the plant is that perfect "hulk" green. This one was put into flowering about 7 days ago.

 

[Dennise]

Hi. It is really hard to tell with the LED lights on her but if you can take some pics without the lights on her with maybe just a CFL or regular light. I will be watching for your reply and will help if I can....

 

[smallstar]

I was not able to get the flower room today, work ran late. I'll be in there with the SLR at 6:30am tomorrow morning. I'll also kill the LEDs to help with the lighting. After learning that it was likely calcium & Magnesium being low or lockedout, i mixed up some Cal-Mag ad added it to the mix pump tank in the dark. Im hoping they look better in the morning. thank you much for your help.

 

[smallstar]

OK here are the new, non led photos. I have to say it looks better without the led on them, but still yellow.

 

[smallstar]

I found the PH to be low. So I brought it up, then added Cal-Mag, then rechecked and adjusted PH again, bringing it up a bit more to 5.6 Really hoping this works. It looks now like only the tops are being effected. I was also wondering if they could be too close to the LED's or the general heat in the top of the grow box might be playing a role as well. Either way, on Friday it's time to start a new batch of h20. I guess adding the "Big Bud, and Bud Candy" nutrients with the new batch of base nutrients will just need to have the PH checked and re checked.

 

[smallstar]

Ah... the difference in a week. Nothing like learning on the fly. Thanks everyone for all the time and help. I felt I should share my results, as it was a pickle and not so easy to figure out. While the nutes might have given it a shock, the real problem was the ever growing tops, getting too close to the LED's. Because they don't throw much heat at all, I think people tend to relax on the heat they do throw, and the range of light they also give off, we can't see , so is also not noticed. The grow chamber holds heat. the top of the chamber is hotter than the bottom, combined with growing to about 12 inches of the LEDs, these guys were getting "cooked"

I just spent my whole Easter morning redoing the sky in the grow room, now they are about 30 inches away and I'm umping cold air from the bottom, and sucking out the hot air off the top. The green has begun to return to the centers of the leaves. I am wondering though, How much, or all of the damaged leaves should I remove? It's mostly fan leaves that took the hits, but about 4 or 5 are toasty