In my opinion UGFs and RUGFs are out of date. I have seen RUGFs be just as bad as UGFs. The biggest problem is that when neglected HOBs, cnaisters, etc. can be cleaned thoroughly and you can catch up. However, the UGF
and RUGF when neglected is so problematic you simply have to tear it out, releasing al that debris into the water column so it looks like there was a sewage leak. It simply isn't that effective and not worth it.
Stick with HOBs and canisters, clean them regularly (monthly), and keep up the water changes.
Sand is a more natural and cleaner option anyways, and not compatible with UGFs or RUGFs (at least not without a bunch of extra work and the same risk as UGFs to begin with).