I've got mine under 12/12 stuck in around the sides of the 1000HPS coverage area... For easy, there are these little almost triangular or heart-shaped chilies about an inch to an inch and a half long, and maybe 3/4 to 1 inch in diameter, I have NO clue what they are but I got seeds fromo someone and they are indestructible and yield a lot of fruit indoors... never tried the 18/6 thing since I've only got 2 rooms plus my cloning closet... but they definitely like the heat! Only problem seems to be with aphids. But I have NO clue about the fertilizer... they get fish emulsion mixed in the soil, and bloom ferts with their water, and I haven't heard any bitching out of them!