I haven’t personally heard of them myself tbh.
but if you are trying to keep them “site unseen” I would look up where they come from, collection points etc. Then try to imitate water like they come from in the wild.
and please document it, report back on here so perhaps future hobbiests who are prospecting them can have a reference of what you did or didn’t do. That way you could be building a road for them to potentially be in the hobby in future.
who says you can’t be one of the first to keep something new to the hobby.
also look up the typical ray requirements and how to keep typical rays for a better head start. That way you have a nice start point.
there are lots of stickies in the ray section to help you get started.