11-29-2010, 07:29 PM
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Pennywort and Wisteria are stem plants, and like all stem plants they grow fast which means they assimilate more nutrients. And ammonia is a major nutrient.
Just a side note for the benefit of jayheuk and anyone else interested: nitrogen is a macro-nutrient plants need. Nitrogen of course may be in the form of ammonia, ammonium, nitrite or nitrate. Aquatic plants overwhelmingly prefer ammonium as their preferred source of nitrogen. Ammonium is a basically harmless form of ammonia--almost all ammonia detoxifiers like Prime water conditioner and such detoxify ammonia by changing it to ammonium. In acidic water (pH below 7) ammonia produced by the fish and bacteria immediately changes to ammonium, and plants grab it. In basic water (pH above 7) the plants have the ability to change the ammonia to ammonium internally. Either way, they assimilate quite a lot of it, and beyond that (as a nutrient), they also have the ability to take it up in toxic form, much as they can take up other toxic substances and heavy metals. But that is another issue from nutrients.
When there are no fish in your QT, ammonia/ammonium will be scarce; some occurs form the other bacteria, but Seachem's Flourish Comprehensive also contains some nitrogen, so weekly use of Flourish (once a week is usually max without fish) should keep the plants "alive." It certainly did for me.