Ok, so I bought an Argentine Sword when I was setting up my divided 10 gallon. It seemed like it was doing great, but now the leaves just seem to be dissolving. My tank is finally cycled: 0ppm ammonia, 0ppm nitrite, 5.0ppm nitrate. I do have Seachem Flourish and Flourish Excel that can be added to help, but right now I just started to have a bloom of brown algae. So, I've stopped momentarily. Any ideas as to what might be wrong?