Just made the switch from glass tanks to a rack. Im mostly concerned about my ball pythons developing an RI due to stagnant air. Currently my temps are good (cool 81, hot is 89) and my humidity is usually around 55-60%. I drilled two rows of holes around the sides and front of the tubs (45 total). I dont have a fan running. Would opening the tubs and allowing it to air out everyday be enough to prevent stagnant air or should I run a small fan set on a timer to promote air flow?