Phosphorous Problem!!!I THINK

hey everyone im on my first grow and i got 4 plants goin rght now. two of them started getting dark purple or grey edged on the leaves and now all the leaves on those two plants have it and they are also all curled up and brittle. any suggestions of what to do or advice would be great, il have some pics up tomorrow night

Take a look at this thread. I saved it on my computer for reference.

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

Good link that shit was useful, thanks

there are 2 other posts in this section about purpling and both are n deficient. does ur plants resemble thiers?