You're leavin a bunch of details out...Lights,intake,outake,etc...No matter...If you wanna grow 2 plants,do it...Forget about 18" flips though...Flip those girls after 8 to 14 days of veg and what you get is what you get...The size that you put a plant into flower has nothing to do with potency...Plenty of time to work your way up...READ,GROW,HAVE FUN!!!

Best of luck to ya...