I haven't gotten any to survive past a few days, so I don't have them in a real tank yet. The sand in the hatchery is from the Toyops kits. There's not really enough to scoop it out. Just to clean out the little container requires some multiple swooshes of water. So I've had a hard time salvaging it, at least in a way that might save any unhatched eggs. I guess it's a different situation if you've had an adult laying eggs in a deeper substrate.
If I can get some triopes to survive long enough, I've got a 1.5 gallon and 3 gallon tank with a sponge filter and some of this sandy gravel: https://www.amazon.com/gp/product/B003JVCSPM/
This one from Amazon
Carib Sea ACS05823 Super Natural Torpedo Beach Sand for Aquarium, 5-Pounds https://www.amazon.ca/dp/B003JVCSPM/ref=cm_sw_r_cp_api_glt_i_266ZHYCP2GC0TK10T2Y4
Regular sand might be cheaper, but this should work: https://www.amazon.com/gp/product/B003JVCSPM/
put a cup of this in a mesh bag in your tank. google pH buffering. Enjoy your reading.