Rubbermaid Ventilation Question..

[Somed00d]

Ok, I just built a 5 tub rack out of melamine. They are the 23x16x6 2221 rubbermaid tubs. My question is how many holes do you guys generally use for airflow. I don't want to experiment too much so any input would be great.

If it helps I will add some more details. Im housing ball pythons and my ambient temps are around 75deg and i am aiming for an 82 degree temp in the tub with a hotspot around 93 deg. Each shelf is heated with a 12" piece of 11" flexwatt that is about 7 inches under the tub and the rest wraps up the back of the tub.







Thanks!