Hi All, This is my first grow in approx week 4 of veg and I have noticed over the last 5-6 days the new growth, although very prolific and fast are yellowish-green in the middle. You can see the lower leaves where they are starting to green up but it seems a bit off to me. As well I included a pic of some brown spots on one of the fan leaves. Any suggestions would be great and here is some of the basic stats as I can recall: DWC 5 gallon Hydroton Medium 600w MH *Guinness 3-part Nutrients *(Hydro store sold it to me and I can't find any info on this brand anywhere but I have other plants which are doing perfect with this nut) I have been following the feeding schedule and although it stops after 2 weeks veg and continues into an 8 week flower schedule, I have been sticking to the 2nd week veg schedule until I flip them. Dark Energy - 1/2 tsp per gallon. 2 Air stones per Tub (approx. 40GPH per tub) Water temp usually around 65-72 deg F. depending on light/dark. PH ~5.8. (Tap Water ~6.8 which I then add Nutrients then PH Down as needed) Lights ~18" from canopy (cooling tubes are being used) I was first thinking that because the plant is growing so fast (DWC is amazing), that I think the leaves are just a little behind in photosynthesis process (if I read correctly before). I have other DWC plants which are smaller but showing no signs of this or at least much less of a sign so maybe this one, as it is larger is eating through the nutrients faster and could possibly be just a deficiency? I wish I could check PPM levels (Sorry getting a PPM meter in a week) but like I said if anything you see jumps out at you please feel free to say. Thanks!