So, are you holding her above the leopard gecko tank? Or do you use the pink sand for your T as well?
If it's the latter I urge you to change it into an appropriate substrate (coco fibre, top soil, etc.). Sand isn't good for your T, it's abrasive, could get into her joints and/or book lungs, and it's not good for burrowing.
@Thekla as in, I have leopard geckos. It makes a nice backdrop shot for a photograph that's different than the rest with a bit of color . I have coconut fiber, and natural substrate for all of my tarantulas . The room that I keep them in is yellow and can reflect light that will dull a photograph, especially if the T is lighter in color as the blondes are . Look at any other photograph I have posted with the tarantula actually in their enclosure. All are on natural coconut or vermiculite mixed substrate. I appreciate your concern and know you are attempting to lookout for the T's best interest. If this photograph offends the community, I will gladly remove it and repost with the T in her enclosure.
Glad to hear that isn't the T enclosure. Personally would be nervous to hold a T over a leopard gecko tank - one startled leap or fall off your hand and it's the next Hunger Games.
I'd also just like to add that loose sand substrate (or any loose, fine substrate really) isn't great for leos either. With their habit of licking things as they explore, they can get impactions - calcium sand is quite possibly worse since the calcium may actually encourage them to eat it. Look up "leopard gecko sand impaction" on google, but I'll give the forewarning that it's quite grizzly. I know some people opt for tile, reptile carpet, or even excavator clay, since it's more solid and actually more similar to their natural habitat.
@Arachnophoric yes I am aware of the risks and mostly agree with you. However, for the first 5 years of my leopard geckos lives they lived almost exclusively on tile. And 2 of them still live on tile. However, I have a gravid female who is laying soon and I have placed her in this tank where she can dig comfortably. The first centimeter is sand, the next 3 inches is moistened coconut fiber that is moisture and thermo regulated, per my original breeders recommendation. The sand just shows me where she dug. It's not a permanent enclosure or setup, only for a few weeks during the year. Plus it gives me a nice backdrop for photos. If this forum or gallery were about reptiles I'd post a photo of the setup so you can see.
There is a gallery for non-invert related images called Not-So-Spineless wonders, but you don't have to post the setups to appease me lol. I've heard of people using vermiculite and cocofiber for holding eggs, but never heard of someone using sand atop that so they can see where the female put them. Very clever.