<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/#comment-97545>
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"I love that we have a resident UGF evangelist!  They clearly work and their falling out of favor is simply up to fashion, IMHO. \n \n\n\n\tThat said, it appears the paper you linked suggests there is an inverse correlation between grain size and plant performance for the species studied.  Because they made no mention of UGF, as you point out, there is no way of knowing how that addition would impact the performance of the plant a priori.  Indeed, what would be known going into studying the interaction of UGF and substrate size is that smaller sizes yield better growth for this species.  Can UGF change that relationship?  That's unknown from this work, but it would seem a reasonable guess that aeration and nutrient delivery to the roots are not limiting factors for this species given the preferences exhibited in this work. \n \n\n\n\tNone of this is to say that UGF don't work with, or potentially even benefit some submerged plants.  Just that I'm not certain the reference you included supports your assertion. \n \n\n\n\tKeep up the good work with the UGF.  I'm glad someone is taking upon themselves to tilt at that windmill!\n \n\n\n"
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>