Is this Phosphorus (P) deficiency??

looks like nute burn maybe try a flush to clear that up, phosphorus defiency sometimes can show up jus after u switch to 12s and shows up as purple stems not a big deal jus give em wut they want. u never want to stress a plant as it slows growth, but u alrdy knew that. happy growin

but there WAS root damage on 2 especially. They had been in hydro for 3 weeks, they had long roots...

I'm just going to wait and give them pain water in a nother day or so.

No I dont directly blow fans on any of them, indirectly I do and always keep air moving

Thanks man have a good 4th