I have read in the forums on seachems website that even though they don't like to admit it, may people have reported Excel in high doses will kill algae. I also saw a post that was inquiring about this also effecting simpler plants and mosses like it does algae. I just thought it might be nice to list some plants that don't do well with excel as well as those that do. Maybe Excel doesn't kill them, but maybe they just can't make use of it.

These posts got me thinking about something that has puzzled me for a while. I have multiple tanks. For plants I have anacharis, hornwort, aponogetons, water sprite and java moss. In a 10gal tank I have that has 2watts/gal compact flourecent lighting, and a heavy fish load all of these plants grow slow but steady. I do not add any fertilizers at all to this tank. On the other hand I have a 55gal tank with 2watts/gal compact flourecent lighting, and a light fish load. I have been using the entire seachem line including excel in the 55gal tank, since this tank was on display for all to see. For some reason the anacharis and hornwort just would not grow in the 55gal tank, even though the water sprite and aponogetons grew like there was no tomorrow. I recently switched from using excel to pressurized CO2 on the 55gal tank. A curious thing happened, a small piece of hornwort that was dieing slowly started to grow again. I haven't tried anacharis in the 55gal since the change but plan to soon. So I'm wondering if plants like anacharis and hornwort, just can't make use of Excel.