You can use an temperature gun to get your leaf temps up to 77. With your water being cool, and the bubbles pushing your cool air up through the plant, I dont imagine your leaf temps will be close to 77. I cant explain why 77 is ideal yet, I just know others here can.
As for your root temperature, I like 72 water temps, yet you will find out real quick how well your system handles the quicker growth of everything.
You have a 12 degree gap in root temperature and air temp. I cant argue how that matters, I just know I keep my root temps at 72 and my air temps at 77, which is only 5 degrees difference. I dont use C02, but I will within the year.
The Nova series is also pretty thick, more for drip use in coco. That said, you dont seem to have a nutrient problem so its good to know it works in active systems, ill jot that down real quick lol. . .1 less bottle to deal with right.
So live or sterile, if you chose to raise your water temps, which I think everyone here is going to reccomened, you will get more fungus growth on your roots. You will need bacteria or chemicles to combat this.