I have a rack system I built myself with tubs. However I think my problem is that it's in our bedroom and the temps are a bit too low. I think that it's like they're in the "cool" season in my bedroom. We're moving them into a different room (after an argument that it was MY house and I should be able to do what I want with it...but that's a whole different story) and I'm going to have more stable/higher temperatures for them.
This is my first year breeding and I'm still learning a great deal, but I believe that its recommended that you fluctuate the temps cooling them down in fall and warming them up starting in January.