From the info you have given so far it seems as if you have a def. going on. Your ph is rising which is a good sign that your plant is taking in nutes but it seems as if it is needing more. At your stage I usually feed at a ppm of 400-600. When was the last time you calibrated you ph meter? Sorry about the late reply but Im out of country! Also if you have any liquid seaweed make a light foliar spray. Most seaweed supplements contain small amounts of nitrogen and trace elements that your plants will absorb that will help with def. When my girls have problems such as yours I tweak my nutrient dosage in small increments( Up or down) depending on the signs ( your ppm is going up so I would lower my nute level) along with the foliar spray and Im usually able to get them back of track. Hope this helps. By the way always do a res change and never add new nutrients to old. I found out the hard way. Your plant might need one nutrient more then others so if you just add new nutes to old you will have a unbalance solution which could result in a lockout. Google nut lockout for a better explanation. When you get to the point when your plant is absorbing water and nutes at the same rate you are on the right track.
thanks for your feedback again. really appreciated
I can see new leaves growing quicker than before, but I still see sign of def.
as this pic shows, this is the symptom i didnt have earlier.
I calibrated my PH meter about I month ago. I have a pen type and also a monitor type that hang on the side of res.
After 24 hours flush, I did the res change on Sunday . I put more water them the system need, like you mentioned I dont need new nutes to old res.
EC 0.3 with maxbloom PH rise from 5.8 to 6.2 in one day
I also put 2ml/ gal cal-mag, and hydroguard as well.
still showing sign of def. I wonder if Im over lighting with my new COB panel. plants under MH in the same system look recovering right now, but its different tho. I have another girl in soil uder that light, start showing the sign too.
This is the one under mh
one in soil start showing Def. after I switch from MH to COB LED. Lighter leaves, some fan leave tend to having brown spots like above leaf in pic#3
Any feedback are welcome
thanks guys happy 420