Leaf troubleshooting

Looks like you have deficiencies. If you had a time release type soil, you may have run out of whatever nutrients it was providing. I don't see any NPK nutes on your diary. Seems most likely if your diary is accurate.

yeah thanks for input ill try turning down the light and seeing if that helps it definitely seems to be yellowing from top down. my ph has been struggling lately its been around 8.2 not sure whats going on but the plants have been growing at a nice rate it seems, so im stumped but yeah my runoff is at about 8.2-8.4 which is mind blowing and ive been feeding jacks 3-2-1 mixing up a 6gal tank at full strength with about 4ml of calmag and 4ml of mammoth p 3grams of recharge and 5grams of bloom from monstertek. feeding around half a gallon to 3/4th a gallon running 1.7-1.8ec @5.8ph and i just started using 5ml of hydroguard with the nutes

Yellowing leaves can be various things my friend the main one being nitrogen deviancy if you have just started flower I can assume you have moved onto a different feed with more P and K. Please do not forget the N. Nitrogen along with Potassium and phosphorous is a mobile nutrient within the plant. Meaning it is in constant use via the plant so to cut her off the supply of N when going on to more flower based feed is quite common so dont worry. Not sure which nutes your using but each brand or most will come with feeding tables with advice on how much of a certain nute to use at which stage of growth this is usually set out in weeks if you follow them feeding tables you can get a good base at what to feed you plants then modify it for each plant you are growing if you see different signs. the other thing is PH levels that can effect the look of you foliage so I would double check they are within stable a stable range. further more to that it could be shes just hungry and needs more than your giving her. Overall shes still looking healthy and its always a good sign to see you have not defoliated the hell out of her so you are going to be able to get her to recover pretty easily :) Hope this helps and keep up the great work :)