I will be putting them on timers and ill experiment with the times so I can get the right humidity. The ventilation spot will me a small screen section at the top. Heres a picture of the tank
10 Gallon vertical conversion kit – Jungle Box

And I found a smaller fan that may work better.. What do you think?
Amazon.com: Scythe Mini Kaze Ultra 40mm x 20mm Silent Mini Fan (SY124020L): Computers & Accessories

Ok thanks, that is very helpful, seems easy!