Thx lynhal,

you're right the post is helpful, except that it got completely hijacked by someone who gre using soil and not hydro. The original poster had a hydro set up similar to mine and the pics used were perfect examples of what I see. But as Rusty Trichone pointed out in the thread, although the symptoms are similar the cause(s) will likely be different, and his repeated attempts to seek advice from hydro growers went unheard.

I should mention that the tub I use is a sog setup measuring 12" x 24" and contains 8 sites.

I still thought it would be useful to post my own thread and fill out a form so experienced growers might catch something I missed.

My suspicions range from cal/mag deficiencies to under fert to over fert. I really don't know.