49!degrees yes you need to move them in. Keep the
lights as low as you can get to the top of the plant so they don’t get stretchy. They were looking good and should’ve had much more growth so yes I would Check the ph maybe every 2 days and as I mentioned earlier increase the watering cycle to as many times as you can till you get the other on/off timer. If you don’t notice a difference within 2 days increase the amount of
nutrients you are putting in the reservoir just a little bit more to see if any changes happen a day or 2 later. Like I said earlier you should’ve been able to see some roots sprouting from the rockwool by now.