Need help on a diagnosis please.

Ok so I have noticed this now on both plants that have gotten about this height. First they grow good reaching every day then near the end of the 18 hour cycle one plant would kind of droop a little after i watered it or just near dark cycle. Did not think to much of this untill the second plant started to do the same. now I was going to go hydro but started using fox farms and still have my ph at 5.9-6.1. Is my ph to low now? Are the drooping leaves normal? I am using advanced nutrients a & b grow. Got them under a 1000w mh 18 hours well vented have cos but no regulator for another couple days but did blast them last night and closed them in closet for 3 hours Growth was noticible for sure. Anyways I am worried about the drooping for sure here are some pics please any help would be great.

My plants have inproved a bit so I am posting pics now to show days into the grow. The bigger plants were mother plants that I got from a friend, the smaller ones that are in the pics are about 7-8 days old and a couple bigger ones are about 4-6 days older. So going from the youngest one I am about 10 days into grow. Here are the pics for anyone to comment on and give any advice since the drooping stopped.

how much are you watering? plants will droop if you overwater. your ph should be okay. also it looks like your plants are stretching in between nodes. how far is your light?

Light is probably further then it should be im about 2 and 1/2 feet away from light only cuz I didnt have my fan hooked up and I am running a 1000w MH but I am lowering it as we speak since the ventilation is hooked up. Was watering once a day but now will water every other day.

Ok so thanks they are looking much better after I stopped over watering them. Still used to hydro not soil. Of course my problem was the easiest to fix... stop watering them lol. ANyways I got some updated pics of the babies here. 2 days after they were drooping badly. First pic is OG Kush second is Ice third is Sensi Skunk and the last one is Ice again but my cat almost killed it as a baby bit almost in half and only had a little leaf on it but its comming back nicely. The Co2 DEFINITELY increases my growth for sure noticable in 1 day. I will update in another 3 days with pics before I start to run Co2.