Sup Bro - I'm kinda new to this site, but I've got a little experience - sounds like you run a similar system to mine - I use flood tables and 4" cubes, I flower outta the gate, and I jam 32 plants in a 2x4 space or 70 to 80 in a 4x4 tray - I just use rockwool cubes - if you go 6" you can...