Have the plants been sexed yet?? Chances are that 1 plant will be male....if you're not trying to get seeds that would leave you 1 plant and plenty of space for a small grow.
My grow box is 30in high, 23in wide, and 12in deep. Attached to the top of the box is an aero garden hood with the two standard CFLs. Not sure of the wattage. At the bottom I have three lamps, two 26 watt 5000k and one 26 watt 2700K. I currently have three plants. I wouldn't be mad if the two seedlings turn out to be male, lol. That would leave room for my re-vegging female. In a small grow space just make sure that you start flowering when the plant is about half as big as you want it to be (size doubles in flowering stage).
Anyway I'd add some more light if I were you...with light more is better...and if you're box is enclosed make sure and watch the temp. Temp has been a problem for me.