Curling leafs

[Rusty Trichome]

...I have 9 plants in veg, and 8 out of the 9 are showing purple on the stems of the fan leafs... I am guessing this is because they are getting too cold at night... I have done some searching on it and come up with two entirely different answers.... mineral deficiency.... and the other says it is a humidity issue couples with too much heat.

Or, it could be a 'purple' strain...which means the purpling is perfectly normal. The purple usually expresses itself when temps drop a tad. (like sugar maples changing colors during the fall)

Question about flushing as well.... the soil these are in is comprised of nute free potting soil, manure, bone meal, and blood meal, and perlite. These have been put together to be nature nutrients but not be able to burn and harm the plants or roots. Is flushing still possible with this soil set up?

Pretty much impossible to 'flush' solids out of the soil. Perhaps you might want to re-think your soil recipe, as you can still burn the ladies using organics.

PH question... does the soil need to be PHd?

I never ph my soil, but it's a pretty consistent organic brand. (Dr. Q's Filthy Rich) I use a ph pen to check my run-off ph on a (somewhat) weekly basis, tho.