Brown/orange/yellow/rust spots again

[Jedi]

Hi guys.......

Ive starting getting brown spots again...

These WW clones are about 2 weeks old....and moved them to this DWC a week ago..

Started with 0.6 ec....and increased the nute strength at 1/7ths over the last weeks
added a totol of 1.2 EC of nutes so far...

Water + Air Temps are mid +-75 fahr.
PH.......5-6


Does this look like Nute burn..
Cal/mag def from too high heat/ over feeding nute lockout..??
(I decreased the water temp btw)
and i suspect too low PH..


the thing is.......I gradualy increased the Nute strenth over the last week and was waiting for (Too dark green) to tell me the nute strenth is getting too strong...
but the colour stayed fine.....and then the spots started to appear

???????

 

[Jedi]

the thing that boggles me is.........

The new growth is booming(looks like they varnished/wet and healthy)
just the fan leaves worry me

 

[Jedi]

Eeek...forgot to add


3 week WW clones in Veg
I,m using these nutes.... http://windell.co.za/prod_nut_a01.htm
DWC.....netpot only......40L Tub..
and about 6 x 15w CLF....(only for veg and move to 400w Hps for bloom)

 

[Weedninja]

Looks like a mag deficiency to me. An accurate pH reading is essential, because in the low 5s, lockouts begin. I would try some foliar epsom salt.

 

[Jedi]

Thanx Weedninja.....

Flushed and yesterday , and phoned my supplier for some
Epsom salt , another nute stock and PH meter and upd and downs

will monitor the plants over the next day or two and let u know whats cutting...

Shot for replying...

 

[Jedi]

Plants are doing fine ATM..!!
(but i miss that ultra glossy new leaf growth)

It could have been anything between

Overfeeding
Low Ph
too high temp..
too little oxygen

and i moved the under 400w hps last night...

gonna flip in a few days...!!

 

[Jedi]

Damn ppl...

the spots are returning...

had them at 1.0 EC(according to my fresh nute mix)......for the last 5 days
PH...btween 5.5 and 6.0
water temps just 65 'f
under 400W HPS

the were doing realy well(slightly on the light side)

and now since the nute strength dropped(and i topped-up with tap water)
and the PH went up from the plants using some nutes

Now then Brown rust spots are appearing again.....
and some reckon its Calcium/Magnesium def and suggested Epsom salts



HELP..HELP...HELP...PLS

I bought some PH up / PH down
and some Epsom slats
(never used these products before)

and scrogged them up tonight and flipped to 12/12

 

[Jedi]

BTW........sprayed it a few time with a Epsom salt solution and it sorted the problem...

PH 6.....
2 weeks 12/12...and starting to flower

and Scrog is doing very well