When you clone from a mother plant .It will be in the likness of the mother. How big are they. Um dont go to 5 gallon if they arent ready yet. several transplants are ok. Flouresents will work, but you will need to get bulb splitters so you can run 2-42 watt cfl's(150 watt equivalent) per fixture.needing several for those 3 plants. 2700k for flowering and 6500k for veg.or you can up grade to a small hps. lowes has 150 watter that will handle the job(for around 80 bucks) with your existing flouresents on the side. being 6 weeks you should soon be ready to flower if they are large enough for ya. Topping means to cut the main cola or stem . Allowing 2 main leaders, if you top agaian 4 main. and so on. With proper light and care that will help increase yeild . To allow 2 topping i imagine you woulds want to veg out another few weeks. But since your light seems to be insufficent they probaly are not to large yet. When using floros compare to hps . your grow time will also be longer, and yeilds smaller. Due to the decrease in lumens when using floros.its worth atleast using one hps with your floros... Learn the basics before you try to get to complex.Read all you can it is here for your use. good luck