1st indoor tent basement grow. New growth / fan leaves curling

[Greenthumbz24o]

Hey guys I have my first indoor going from clones in a tent in the basement. I have 5 total ( Gorilla Cookies, Juicy Fruit, Purple Rhino x2, and a Silver Pearl). I have had them for a few weeks now and while they have filled out quite a bit they have some odd growth indicating issues. I want to take care of this ASAP so I can switch to 12/12.
I will mention that I have been watering with store bought distilled water which I realized later needed to be ph adjusted (too low). It is also still somewhat cool down there at night. I am using a 400w hps with no glass which helps keep it at a decent temp. I am adding 1 tsp cal mag to each watering and have been using fox farms grow big in fox farms ocean forest soil mixed with sunshine mix. Up adjusting ph with ph up after initially noticing odd growth.

Here are some photos. Any ideas from experience? I’ve grown out doors off and on for years but haven’t encountered these issues. Thanks for any help!

 

[big315smooth]

just had a few plants do this to i thought it was from my room being alittle cool.guess we'll see what more experienced heads have to say

 

[Lost in a SOG]

Root rot, pH issues, cold soil.. nutrient lockout..

Temps cant get too cold at night. My guess..

 

[Greenthumbz24o]

They were given to me in solo cups and were definitely getting a bit root bound outgrowing the cups. Hoping it’s not any root related issue. If it is temp related do they generally perk up with higher temps. Thankfully temps are on the rise.