It has been a long time since I used an aquaero, but look at the option in the menu above 'fans' labeled 'Controllers'.
I believe you can define your controller there, and then associate the fans you want to control, to that controller.
Thanks, actually ended up figured it out after a while. Thought it might have been an issue with my arctic fans as I read there were some issues there at some point. Didn’t realize it would be in a different location from what I’ve seen. Is that a difference between Quadro/Octo and Aquaero or just different location in newer version of Aquasuite?