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.