the thing about having six in there is how tall they are going to get in that setting. i am going to have 6.5 sq feet and I will have six girls in there but I may have to flower at 8 inches since they seem to double/triple in height when flowering. If you know what you are going, 3-4 will be great, I am sure I am going to mess something up so I want more in case anything happens (like nute burn)
Rippey