helllllpp!!!!please

hi all well about 4 weeks in to flower on some auto lowryder and my leaves a starting to get brown spots im thinking cal def but not sure
any one know what it could be

What medium etc are you using? I would put money on ph issue.

useing john innes number 2 feed is biobizz grow and biobizz bloom i use buxton spring water with the feed light is 400 watt hps

Get some Cal-mag and you'll be fine.

Check this out http://www.drugs-forum.com/growfaq/97.htm