Leaves droopy on one, couple others have lower leaves turning dry and yellowish brown

my roomate and i bought some clones approx. 18 days ago. most of them were in small pots and had one slightly larger one that was in a 3/4 gallon. since then i have transplanted all of them except the larger one to 1 gallon pots and all are doing well except for the larger one. they have been outside now for about 8 days and doing great except the larger one is beginning to droop. it is a sour grape strain and unfortunately since i didnt plant i dont know what kind of soil it is. first noticed the droop right before night and read up and seen that that could be normal but now it has a slight droop at all times. i am using fox farm grow big every other time i water (1 tsp/gallon) and dont beleive i am overwatering. also i have been taking them outside at 5am and back inside at nights around 9 pm and slowly winging them from 18/6 cycle to the natural 16 -17 cycle as they will be goin in larger pots in a few weeks to stay outside(the lights are 4 tube flourescent 150 watt). the water i am using is well water(no softeners) with a ph of around 6.8 but have been told it may contain high amounts of iron, could that be an issue of blockin nutes? additionally a couple (3 out of 12) have bagan to turn yellowish brown towards the bottom of the plant but the top maintaining a strong green. anyways heres a couple pics. please help me out and take it easy on me as i am a 1st time grower. thanks

looks like it needs to be watered.

i have been watering them every other day to every 3 to 4 days but maybe im not giving them enough as i have only been giving them 2-3 cups each time. also shoul i wait for the soil to completely dry because it is still slightly moist on the bottom when i water them

over-watered, over-fed

yes.........let them dry out between waterings, and feed less often.

Sucks not knowing what the soil is, it might have nutes that are slow release like miracle grow. may want to take a few clones off that plant and just give her water and see if she recovers... Good luck

yeah i will def try that, i have only fed them once which was 4 days ago (11) but i will water them again with just h2o again before adding nutes.

yeah it does. the sour grapes in the 3/4 is the only one that i have no idea. the other ones in the 1 gallon pots are in soil i purchased locally from a guy, it has been used once before but is suppose to be completely organic. i have added some worm casting and kelp meal when 1st transplanted but still am not 100% on what else is in it. tested it with a soil test kit for npk and eveything looked okay