Alright so my little guys are about 4 inches and I see pretty little roots in the bottom of the cubes so i guess it is time to transpant. Here is what I have done: Raised the 1000w hps so it will be about 4 feet away from the seedlings and I have soaked all 21 4 in rockwool cubes in the res. full of ph'ed water and nutes (General Hydroponics) So I just snap those rockwool cubes off and tanspant is there anything I am forgetting tips for the best sucesss ect, also I just don't know how long i should veg them for, I have a 4x4 tray and a 1000w hps with maybe 14 Flowering females I am scared they will get to big but I also want to get the best yeilds so I don't want to waste any space I now have 10 Northerlights x Skunk 10 G13xBudda and 2 Hindu Kush Should I veg for a month or 2 Weeks or what. I can't judge how big or fast they will grow with this new setup I know that a Soil Grow 14 Plants couldn't fit in a 4x4 area

No need to "snap" the cubes off. Just bury them in the medium you're using and they will continue to root there. Are you using GrowRocks, larger RW cubes ...???
Vi

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I am Transpanting into 4 inch rockwool cubes...do you think I will Need to move the 4 inch cubes to like a pot of grow rocks or something?