Lol... I should of known that was a silly question.

Ok so It's day 2 of flower and plants look good. Growth has stopped and they have been at a stand still. Earlier in the thread, in Veg stage, I fed according to the Fox farms nute schedule for hydro. My ppms were 400-500. I think I just realized why my ppms are lower then some.. On the chart it shows "Solubles" and also "Bush Doctor" . I haven't tried these products, but they are added along with the trio pack of tiger bloom, big bloom, and grow big during the life of the plant. If I were to of added these per dose at specified times, I'm assuming my ppms would of been closer to 800 or so. I'm thinking about picking these up and giving them a whirl. It depends on $ of course. I had a few questions:

For soil, towards the end of the flower stage, 2 weeks to be exact, it is suggested to stop feeding completely. Is there any rule for hydro on this? I haven't heard anyone say to just use tap water in Rez for remainder of time or such..

Also, I am running two 400watt HPS batwings now.. I think I read that 400watt is a 3x3 area for coverage? Currently I have my plants aligned in a 7x4 area, and they are rubbing elbows in a bad way (figure of speech). I've been looking into 1000w systems and have seen a few on ebay that have caught my eye. If I was going to go 1000w, I was thinking of the hood with a tempered glass setup, having a duct run from one of its side to displace the heat. But what I was confused about is the other style that just has the cool tube, with sides as reflectors... Is this one just for ease of mounting, or does it have a better cooling mechanism? I'm thinking the only way to cool these is to take the heat and move it elsewhere. So in a sense, the first option is way better when you have a room for use? The mountable one is more $ too... 1000w is 10x10, even at 2-3ft above the canopy correct?

One last thing. I read on a few grow logs when people were asking when they should flower, and and it was said to wait for preflowers?? What do preflowers look like? Do pistils come out before you even change 12/12? It was said that the plants will tell you when it's ready to flower, and at a certain period, you will get 2 inches of bud for ever inch of plant? I've never seen or heard of that.. I may have just graduated to a horticulture apprentice.. lol