This margin curl appears to have spread from one plant to 2 of the other 3. So I assumed not pH, not lockout, not nutrient based. Roots all great. I've culled the 3 and there is 1 survivor doing well but what was this? In the diary I mention using Temprid FX, Neem, Spinosad.
Like the Wham Boom they started with, experienced some brown slime in the first week after the addition of / despite the addition of Hydroguard and Wykos WP - needed some H202 to balance.