I'm with Leigh. I don't get root rot on any plants, stem or otherwise. Stem
plants are seldom in the Flourite more than a month anyhow!
I researched UGF for planted tanks way back when I started mine. George Booth
had a great slide in one of his presentations: "This (lush) tank dispells the
myth that plants can't grow with a UGF." Then he explained how he only had to
break down the tank every 6 months to untangle the roots!
I decided UGF wasn't for me.