First grow ever, and it's DWC

Guys here we are for the 1 day of the second week. today's been a big day, I transferred the girl into the net pot and clay, i also bought a small water pump to help me with the drainage of the bucket one every 10 days and I am using it as dripping too in the meanwhile. I increased the ppm, and raised the ph level a bit to 6. I also bought a new air stone as mine we 2 small 2cm once that were floating so i got a 5 cm diameter ball which is bubbling very well, I am very happy with it. I have some struggle with the temperature which tend to go a bit higher. TO BETTER DESCRIBE THE PROBLEM I TALK ABOUT IN THE QUESTION, REALLY HAVE THIS HEAT PROBLEM, THE ROOM HAS A DOOR WINDOW ALWAYS OPEN(JUST THE GLASS DOOR BUT WHEN I GO OUT THE OUTSIDE WOODEN DOOR ARE CLOSED, THE DUCT HOSE IS EXPELLING THE AIR IN THE SAME ROOM ABOUT 2 METERS FROM THE GROBOX. PROBLEM IS MY DWC BUCKET IS BLACK AND THE WATER INSIDE BECOME TOO HOT AND SMELLY. NOW I HAD TO REMOVE THE BUCKET LUCKLY THE PLANT DIDN'T GROW YET THE ROOTS THROUGH THE NETPOT. PLANT DOESN'T SEEM TO BE AFFECTED YET hoping to see the roots pocking out the net pot in the next days. also have some doubt about the color of the leaves, I am sure it's just overthinking but it looks like they have a sort of darker shade. (see pics) guys as always any recommendation or suggestion would be very nice from you. and sorry for my english but that's not my native language cheers