couple things, what kind of substrate are you currently using? also in a 40 gal long, you may also consider putting a 50 watt bulb at the middle of the cage. I have found that the cage at the cold side can get down much lower and the ambient temprature stays up a little better with the added bulb. Also I this is my own opinion from experience, but even some fake silk plants that look kind of deserty are very welcome. In nature they often stay close to the base of small bushhes and plants. The outside fixture is probably the best in that there is nothing like the sun (real sun). Night consider using cememnt block (home depot) very cheap and make a two foot high square what ever size you want in the back yard and make a 1/4 mesch screen top out of good 2x4 lumber (be sure and paint the wood as the elements reek havoc on wood, with a hinged top and this works very well. Concrete block is about $1.12 a piece and they are 16" x 6" X 8" which means 4 blocks laid in a row are approximately 5 ft long. And two blocks stacked on top opf each other is 32 inches high, you need to line the inside with some small rock and then buy playsand and fill up half of the outside with playsand and leave the other natuiral, dig up the gound on the natural side and plant some plants in there, even native plants from the same area they are found such as crosote, catus etc. This will go a long way. Last thig is to take a piece of 4" PVC with a Tee installed in the middle and capped on the ends (line the inside of the pipe with #_M non-skid tape)and then bury itin the ground and put an extended piece coming out of the tee to the ground level and then cover with large flat sand stone rocks or shale or even large concrete stepping stones so they can crawl under and find the hole when it rains or it gets cold they have a den they can go down in. A foot of sand over the PVC will keep it insulated well. Hoe this all makes sense... There are many ways to make these but the wood prices are going through the roof, and wood does not do well after being exposed to the elements fro years, where as the block makes an excellet and strong enclosure. Just another thought to consider. Good luck and cheers!!!
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