I have had water wisteria in my tank for about 4 months. Since I added it, it has grown from about 4" to about 18" in height. Just recently (within the last week or two) the edges of the leaves have been turning brown and curling. I tried rubbing the dark spots off, and it seems like some of it does come off, so it may be algae, but I'm not 100% sure. None of the other plants in the tank have major algae issues. The new growth is bright green and healthy, so not all of the plant is affected. Could this be due to a nutrient imbalance, improper lighting. It's a 72 gallon tank and I have the 42 watt light. I also use the 24/7 lighting mode where it starts off in the morning with an orange sunrise that converts to a white daylight, and then fades to a blue sunset. I use root tabs for my swords and the NilocG PPS Pro system for dosing micro and macro nutrients. Any ideas on cause, and how I should fix it? Should I cut off all affected leaves?