yellowing leaves

[dougoi7]

hi all

my bubbleicious plants are around 1 month from seed,there just in rockwool cubes,under 600w hps and are getting fed on ph'd Hesi hydro growth,but now the leaves are going yellow,not just lower leaves but new growth too,ive posted some pics,so hopefully someone will know whats going wrong here

thanks dougoi7

http://img180.imageshack.us/img180/6845/dsc00322mu5.th.jpg (http://img180.imageshack.us/my.php?image=dsc00322mu5.jpg)

http://img20.imageshack.us/img20/6640/dsc00329tb3.th.jpg (http://img20.imageshack.us/my.php?image=dsc00329tb3.jpg)

[bejay]

check out the plant problems guide in the faq from og to see if you can find out whats cauising the problem looks like it could be a few possibilities such as mg, mn or even iron deficiency.
Drugs-Forum - Cannabis cultivation: Overgrow's GrowFAQ (http://www.drugs-forum.com/growfaq/GrowFAQ%20Basic%20Topics.htm)

[JackdaWack]

looks like premo Mg def.

[dougoi7]

thanks for the avice guys

[farmerjz]

check out the plant problems guide in the faq from og to see if you can find out whats cauising the problem looks like it could be a few possibilities such as mg, mn or even iron deficiency.
Drugs-Forum - Cannabis cultivation: Overgrow's GrowFAQ (http://www.drugs-forum.com/growfaq/GrowFAQ%20Basic%20Topics.htm)very gd web page lots of info thanks 4 that