Risk and Rewards. I use a lot of UGFilters with power heads so sand isn’t an option in those tanks. I also run HOB and/or canister filters and if ever had one running that had picked up sand and now is grinding and ruining the impeller you know why I don’t use them on those tanks. Also if you get the tiniest piece under a mag float or a scotch brite pad while cleaning the glass. Game over - scratches. Some plants have a hard time getting a good root base established in sand. I guess I’m just not a fan.