I used the very same diameter Gliss this past spring. I wouldn't recommend it for ice fishing - that stuff is very buoyant. On top of that, its abrasion resistance was awful. It peels like string cheese. Gliss isn't woven or braided, I believe. Instead, filaments are bonded together unilaterally somehow. I had a tough time snugging down the knot without incurring some fraying and peeling.
To answer your question, I used it both with a fluoro leader and without one. Tying direct worked well enough, in that I still caught fish.
I liked it enough to buy a few more spools, but it has a very particular use for me, and I wouldn't want to use Gliss for general open water and still less through the ice. Because of its low friction and small diameter, its castability is great. I didn't experience any cling or line slap as I've had with Sufix braid. It just floats right off the spool. Its buoyancy lends itself to longer casts, too, because I loaded up with a heavier weight to compensate and keep my lure running at depth. That resulted in bombing the opposite shore, almost.