Purple Haze x Malawi RDWC

First week has been a rollercoaster of emotions, since this is my first grow, i am having multiple issues, one day it looks good the other it is not, but i think i solved most of them. First problem was ph, I keep adjusting the ph as it fluctuates a lot, in the photos the plants are showing yellowing leaves, it was because of high ph levels, i adjusted it, and the plant continued growing nicely i guess. Second is water temperature, it was very high, ranging at 25-28c , so i got a small chiller and cooled it down to 18c. Third was light, it was low so they stretched a lot, i fixed it the next day, and added sticks to support them I am going to change the water this week, also increasing the nutrient ppm