<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/#comment-97488>
<http://schema.org/text>
"Didn't know that. I have thought that the roots will block the water flow when penetrating inside it. Currently am waiting for a 75gl (3'x1.7'x1.7') tank and depends on the substrate I might build an UGF using 3/4\" PVC tubes and an air pump to work together with a large canister.\n "
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>