well get some 6" square pots with holes in the bottom and fill in around the clone! only go 3/4 of the way to the top with the hydrotron. in a 3x3 tray with a 6" pots u can do 36 clones, mine go in 3 week intervals and broke down to 3 stages from left to right it goes week 1-3, week 4-6, week 7-9 and then I have A homemade flush station were I flush for 2 weeks with plain water! Keep an eye on ur PH keep it at 5.5 to 6.5 ( mine stay's at 5.
I am using A 400 w MH for my mother's (veg) and it work's great!
How are u rooting ur clones?