Plants are slowly dying, don't know why
Good evening, all. As the title suggests, I have several plants in my tank that are slowly dying (the most obvious of these being my Amazon Swords), and I can't figure out why.
I have a 5 gal fluval spec v, and I upgraded the light to the current satellite freshwater LED+ light. My photo period is ~10-12 hrs/day (this may be too long but I try to go along with sunrise/sunset), and I dose with API co2 booster daily (1/8 tsp, since that's roughly what it works out ppm wise for 5 gallons), and Flourish Comprehensive 2x/week. I do a 1x a week 20% water change, and the tank is stocked with one male betta, and a mystery snail.
In addition to Amazon Sword, I have anubias, java fern, and water wisteria. My water wisteria are going INSANE, they *love* the tank. They are growing larger and larger, and my floating ones have roots so long that they get snagged in the anubias quite frequently. The java fern seems to have no opinion whatsoever, and is just quite happily going about its business being a plant.
My Amazon sword, on the other hand, are slowly turning brown and dying, one leaf at a time. It starts with brown speckles and then spreads to the whole leaf. In addition, I have noticed that the leaves are quite light and have black stripes on them. These plants are the worst off out of all of my plants. The second worst are a few of the anubias leaves (not full stop plants, but leaves on the various plants), which almost look like they've been dusted with white chalk particles or something. They aren't a solid green. Also, some of my plants look like they have brown dirt on them. I don't know what this is, though I assume it's algae.
Finally, a couple of my decorations have started to grow a little bit of green algae (as have some of the rocks in the tank), and I've got a small spot of brown algae on my glass. In an attempt to stop this, I've cut back the amount of light I give the plants per day, started feeding my betta less (he's a fat cow and should be fed less anyway), and have been doing larger water changes. I want to stay ahead of this problem while I still can, so I would appreciate any advice you may have to offer. This is my first planted tank, so I am not sure where to proceed. Also, I have attached photos.
Thanks in advance!