Controlling your humidity is a must for all tank owners!
And do not cover your tank with glass or acrylic. Your tank needs to get rid of CO2 gas, and by closing it off, you can suffocate everything!
As for my setup... here are my pictures:
Two fans, vented outside, on two dehumidistats.
And the write up:
http://blog.fragd.it/2008/11/28/a-re...-continuation/