[/QUOTE]Also hornwort, java moss, ricca, elodea ... Actually, any plant without stomata will be Excel (and bleach) sensitive. Sometimes you can dose 1/2 & get away with it ... sometimes not.
I'll take your word over mine, but my Java Moss was always slow growing in lowlight tanks. After dosing the recommended levels of Excel in various tanks, the stuff started growing like crazy without any meltdown whatsoever. In fact, I quit dosing Excell some of the tanks because of out-of-control growth of the Java Moss.
Just my experience.
Now I did screw up and dose a tank with marimo balls in it, forgetting it is just a decorative algae. BIG MISTAKE I forgot to mention on Excel's meltdown potential...