09-14-2010, 01:21 PM
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i had the same black algae on my amazon sword and pygmy chain sword. On byrons advice i cut back the lighting by 1.5 hrs per day and started fertilising with flourish. I also think that because I had my light to come on around lunchtime til the evening time, the tank was getting a few hours a day of dim natural light, which may have been contributing. I've now adjusted my light regime to closer to that of the natural light (which unfortunately means less viewing time in the evenings). This algae has stopped spreading now and seems in check. I found that the only way to actually get rid of the existing algae was to remove badly affected leaves and get a couple of amano shrimp, which did a good job of eating most of it.