planning to grow 8 plants in a 120x120x200 tent under a 600w hps in flower, not sure what hydro system to use as i would like max yield.

any ideas guys

Get your environment right and most systems will yield pretty much the same.

how about soil?

You'll shave a week or 2 off veg times with hydro but they yield about the same.
Systems should be the last thing you lay out for, the bulk of your budget should go on beefy intake/extraction fans and filter, heaters etc..
Good yields are down to your environment *and veg times* more than owt else.



*edit

COCO! Either drip fed (recycled or to waste) or handwatered. Big yields, user friendly, fandabbiedozie.

GN

are the heaters for the water tank (if any) or night heaters(oil rads).

thanks for your help Hipgnosis

Both. Buy a good reflector as well.

I have to slightly disagree with pretty much the same, a flood and drain system in the same environment as an nft system, scrog setup, in my experience will be much more productive, maybe %15 thats keeping it conservative. But everyone is different.