Over the past few days my fan leaves have been yellowing from the bottom up significantly. This would be normal later on in flowering but at only 3.5weeks flowering it seems a bit early. My guess is the MG soil has run low on nutes and I'm seeing a nitrogen deficiency. (It doesn't look like a lockout because my PH is perfect and I'm OCD about that.) MG is really unpredictable; in the beginning I had nute burn pretty bad and now I'm suffering from a def. I made a mix of 1/4 MG bloom booster (15-30-15), 1tbs molasses, and distilled water. I'll feed the nutes every other watering and molasses every water and plan on upping nutes to 1/2 next feeding. (So keep an eye out for a def in flowering bigPapi49 and be prepared to add nutes.) One of my WW's now has an 8 inch cola fully filled in with another 2 inches closing in fast. The other WW, which is a little younger, is still working on closing the gaps. Both are covered in trichs!
I've also replaced most of my CFL's with a 150w HPS and just 4 42w CFL's for side lighting.
I've finally found a hydroponics store located 40 minutes from me so I'm going to bid MG soil and nutes farewell next grow. My first two grows had issues related directly to MG and its just not worth the hassle. My first grow was burned so bad the buds never really did much of anything and I ended up with very little yeild. This time I added in 1/4 perlite which seemed to help but I've still had issues. I'm willing to bet I can improve my next grow massively by investing in Fox Farms Ocean Forrest soil and a tripack of nutes.
Good luck bigPapi49.