<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/#comment-97632>
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"UGF’s have certainly fallen out of favor in the last 20 years or so, but you know what?  They make excellent slow-flow plenums.\n \n\n\n\tI just built a couple of tanks based on UGF’s as plenums, and I will never build another tank without one.\n "
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>