In the wild they live on rocky outcroppings and hard compacted earth; so the most natural substrate to use is slate or tile with natural washed playsand filling in the cracks. These geckos do not live on inches of loose sand in the wild, and even with a varied captive diet they often will still ingest it. Another safe alternitive is taking the playsand and getting it wet, then packing it down as hard as possible so the surface is solid; then let it dry. I definatly wouldnt use woodchips, or calcisand/desert blend (that walnut shell crap), those are extremely dangerous and have killed many a reptile.
Cleaning poop shouldnt be too hard, just take a wet paper towel and whipe it up. Many geckos will actually pick a spot to go to the bathroom in and only use that spot, so there you can place a paper towel to replace when needed.
Your getting more then one? If they are going to be housed together you need to go over the same facts as you would when planning on housing snakes together. While theres usually notably less risk then with snakes (when the same size you dont have to worry about cannabilism), but I have seen more cases of one dominating over the other causing it to stop eating and stressing the little one out horribly. Two sexually mature males will fight, and young males will breed with young females before they are developed enough, just as with snakes.
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