U should only grow one plant per square foot and possibly less, your going to have an overcrowding issue, and light penetration will be close to zero. I would keep what u have now, and when u start to flower, u will cut out males any way, and then u can have ur pick of the best ladies, grow 1 plant per square foot, this way u wont run into problems later. having that many plants wont be an issue until they get big, so dont worry just yet.