I have 2 tanks. Used LS
for both and had no bad hitchhikers. I actually like the bits of shells and things that come in the live Sand.
You can do barebottom. Sand is good too, not hard to clean at all. I just hold the vac slightly above the sand and it pulls up anything on the sand. Just don't dig the vac I to the sand. I e heard good and bad things about crushed coral. Have heard it helps with pH, but have also read that it doesn't do that. Not sure which is right. The crushed coral bits seem too big to me and that they would easily trap detritus, but again, I've never used it.