Is there a fan in front of the HDD bays? It looks like there is one but I am not sure.
But I can see why you might not have good airflow. The cable management is decent considering you cant route behind the motherboard tray, so that isn't the issue. Its more the lack of fans. With only one (120mm it looks) intake, there wouldn't be much airflow through the case.
Yes, there is a fan in front of HDD bays. Should I run this fan also but it's about cpu that's getting very hot not the hard disks.
ok, I will add one more fan at the top.