I like using the 16gal., More air space & root space, & also stay's cooler.

The spray'er's , 180d. around the outside, 360d. in center, I like to come from all direction's.

If You have 2-Plant's in 1-Pod, That's 7-mister's, You need a 290GPH Pump, Every Pod You add, add 290GPH to Your Pump size.

I dont like haveing water in the Pod's, If that's the way You have to run Your's, Well that how it will have to be, Make sure you have alot of oxygen in You water!!! The reason I don't do this are, 1st I don't like My Root's submerged in water, Ilike them to soak up as much fresh-air they can. 2nd I don't have to disturb the pod's, except a peak to make sure the mister's are doing the job. & The res is seperate & I can deal with it from under-neith.

As far as the PPm, What ever Nut program you go with, I use GHP Nut's, Go by the chart's the company suggest for what ever stage.

Hpoe This Help's!!~~~ I don't mind Helping. If you were closer I would Come Build it for You, Hey that's what I'm here for is to Learn & help with what I can Share. Peace:hippy:imp:imp:imp: