This came in named Cyclopogon wexleyanus, and is happy living at the dimmer end of my big mixed tank, (pic taken when fairly newly planted).
It hasn't flowered yet, but the foliage appears very similar to Sarcoglottis. Is it a different plant?
When I planted this, I buried all the visible roots, but subsequent growth indicates it probably would prefer the crown at surface level, with some fat furry white roots showing.
For me, it has spread only vegetatively. Like some other jewel orchids, it tends to grow tall, flop over, and grow new crowns from nodes touching soil. I expect it would like some leaf litter too, seeing your pictures.