Space VS numbers

WhOoP WhoOp, i have 3 plants in my little home made grow box, and i do mean little. 2 Crystals and one pure Afghani. I know the afghan can get to be a good size but i'm not too sure about the crystals.It's built for 4 CLFs at the moment i hope to add two more here soon. The box is 27 1/2 inches wide, 18 inches deep, and 2 feet high. Ventilation is great and its FULL of light.DO i have too many with the space available? any help would be great thanx!
 
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