help leaf issues

hi guys need advice

in biobizz allmix soil, 5 weeks old, fed 1/4 strength biobizz grow 2 waterings ago for first time, temp is 70-75 daytime, 60x60 grow tent,

basically plan on feeding every 3rd watering.

think its nute burn off the soil but need advice as its gotten worse, it was on one leave now spread to several

any help would be amazing cheers

Looks like calcium deficiency to me at first glance...

(well those pics didn't take long to stop working, from the following link)

http://www.icmag.com/ic/showthread.php?t=11688

This could very well be going on due to pH issues, I'd get a meter and check your water and soil levels perhaps. Nice avatar btw, that's my shit!

Looks like the early signs of a calcium deficiency too me..

I think Ca def but not sure many times lock of Mg cause some else lock of Ca can show like Mag def ...
What ph do u feed them ?and very important of the ph runoff 2

The pH of the run off water indicates little if nothing about the actual pH of the medium in the container.

cheers for the advice guys, pretty sure it a cal def so just got back from the garden center with some garden lime, so ill give this a shot. im all organic so not paying to much attention to ph levels im affraid

+rep u up folks

i dont ph either my plants are amazing stil super healthy leafs and almost 4 weeks from harvest ! hoping i cud be like uncle ben n keep em all the way green till the end ))

juust hope my hydro dude replaces my bulb )