I have slowly been converting an established fish only tank over to planted. One of the first plants I added was an undulata. It's been doing great for over two months then all of a sudden it started looking strange. I've been dry dosing ferts using EI and can't figure out what's up. Leaves have a lot of black on them and are curling. Some of the younger leaves on my swords look similar.
The tanks a 125 tall with co2 and has a custom hood with 6ea 65w and 96w pc bulbs with a 10hr photo period.
The black is BBA. Can you increase your water circulation and add more CO2? Cut back on your photo period to 8 hours until you have things under control and balanced.
I was going to say the same thing.....reduce light and increase co2. I did that when I had a breakout and a few days later it was all gone. Also get some true Siamese Algae Eaters and a few amano shrimp. Also my Molly's love to eat it as well.
Help please 
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