<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/#comment-97655>
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"I’ll certainly admit that UGFs are very much out of style atm (I don’t think we even sell them at my LFS) and while all the above is very much valid, I do think that one other disadvantage (which credit to Cory for bringing this up in a livestream) is that most UGFs are one size fits one size, there’s no one size fits all UGF that is functional at the same capacity as what you’d expect. They’re not upgradable if you get a bigger tank, whereas other filters you can always run smaller filters on bigger tanks in conjunction, and use that to help quicken the cycle with needed. It’s not necessarily a con that you can’t use it for the cycle, but more so lacking a perk which canisters, HOBs, and sponges all have. I did consider using a RFUGF for my saltwater mantis tank build but ultimately went a different direction.\n \n\n\n\tUltimately, I think that the turnoff for me for UGFs is the lack of upgradability, and I think that goes for a lot of people in the hobby right now, most people end up moving or upgrading or swapping tanks a lot more frequently and UGFs make that more complicated than other filter styles that can run on a wider variety of tank shapes and sizes.\n "
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>