good eye paranoia... the temperature fluxuations are probably the biggest problem i have been trying to deal with. Our house bleeds heat, and it has been cold recently. I would say that the last few weeks the temps have fluxated from 78-72 during the "day" to 55-67 at night.

I want to get a protable fan/heater combo to run at night to keep humidity down and temps up... its probably too late to make much of an impact on this grow though.

One of the plants stems has had dark purple veins running up and down it for some time though, that may just be genetics