I use a 38 qt long tub. Its short and long. For my babies I use 1 hide and 1 water dish and for the adults depending on their size I use1 or no hides. I use a rack system though so i would recommend that you use a hide. I'm on my phone so i can't post a picture but i have some on my website on 'my set up page.' As for set up a heat pad or flexwatt and at the very least a dimmer since you said the room temps vary. You may still have humidity issues but it will be too much humidity now. To solve that just put more holes in the tub. I use newspaper because its free and is fool proof.