I've been tempted, but you'd need cuc that can turn over sand and then they would mess up your layout of frags. You might want to just put empty plugs or tiles around frags so they can grow on that.
I dont have any issues with sand... But I do use flat square plugs vs your other plugs..
For many many years.. Sand has always been used and has done well for me.. I just wouldnt use more that 1 1/2" of sand. I do have a CUC, but who doesnt Also have a sump with skimmer that helps with any issues down the road