help(pic)

[sc0usa]

all the bottom leaves are showing through but now the last few days some of the fan leaves have like pale burns and the very bottom ones have shriveled and gone crispy with brown bits(not really starting fom edges though,the rest of the leaves look fine,my ppm is 850 and my ph is 5.6/5.9 so would that be nutrient burn,im using a 400w multi spectrum lamp/bulb 18/6 about 17/18" away from top of plants in a hydro ebb n flo,using rockwool,temp is 27 degrees, flooding 15 mins every 6 hrs in the light(3 times a day)and there are 6 three week old white widow,dark i dont flood,i know i havnt got pests but does everything sound right and look right or am i doing anything wrong? hope u can help me.
here r a few pics,u can see what i mean on the close up shots.

thanks people

[sc0usa]

its ok,ive sorted it,it was my ph meter it was readin 0.9 to much,i only just bought the ph calabrator so the plants had a few days of the ph at 4.8/5.0 lol...
neways they r fine now.

thx people :)

[sc0usa]

heres some pics of them now,oldest is 4 weeks from seed ,youngest 3 weeks.


if u look at pic 5 you will c preflowers,is this normal after only 4 weeks?

cheers guys

[mrxthethcman]

Is ur lighting down to 12/12?.if so thats y there showing sex,if not dont worry mine did the same thing.Im only 4 weeks away from harvest and the bud are big fat and juicie.

[sc0usa]

no im still on 18/6,when do u think i should change cycle?

[wardrobe grower 78]

i just changed my light cycle to 12/12 tonight and my plants have been growing for just over 4 weeks veg from seed in soil.
you should maybe let them grow another week so as the 3 week old plants can catch up to the 4 week mark before flowerin.1 week can make a big difference i found :D
happy growin scousa

[sc0usa]

yeah i might do that, ill see how big the smaller ones r in a week or so.how many inches in hight do u think i should start 12/12?

cheers m8 :)

[wardrobe grower 78]

its up2 you depending on how tall you want them to get,mine were between 18-21 inches before i put into flower and now 2 weeks into flowering there between 30 and 33 inches if that can give you an idea of how much they stretch on 12/12

[sc0usa]

yeah, nice 1 grower :)


thanks for the reply