<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>
<http://schema.org/text>
"I am really happy for Cory and the fact he has his own sponge product,  but UGFs are so much better, IMHO.  They NEVER go bad, they never wear out, they don't eat baby fish or shrimp (not that Cory's sponges do, but we all know sponge can be carnivorous) \n\tThe list of PROs is SO long and the list of CONs, is well most of the CONs, proper use and education will remove.\n \n\n\n\t\n\t\t\n\t\n\n\n\n\tThis is very similar to the 30 plus year old UGF I have in several tanks.  Don't remember it being this expensive. https://www.amazon.com/Lees-Premium-Undrgravel-18-Inch-48-Inch/dp/B0002APVAW  \n\tI have may like this one https://www.amazon.com/Penn-Plax-Undergravel-Filter-Aquarium/dp/B003UTNOU6/\n \n\n\n\tBut these break easy!  \n\tI made one like this using PVC and https://www.amazon.com/Undergravel-Filteration-Bottom-Circular-Aquarium/dp/B00ZUIRGOU/ \n\tusing lava rock and it works very well!  \n\tGoing to watch some videos that I might  want to share in this thread.  BRB!  \n\t \n \n\n\n"
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>