I have a 30 gallon community tank with two Amazon Sword plants that aren't doing so well. They look like the leaves are decomposing from the center out. Also, the new leaves emerge colorless and with a rough surface and rippled edges. They eventually gain color but still retain the wavy edges. They are rooted in a 2 ½” deep gravel bed, fertilized with Seachem root tabs and dosed with Flourish twice weekly. Water params seem fine, 78degF (a little high maybe?), Ammonia 0, Nitrite 0, Nitrate barely measureable. GH/KH is around 53ppm.
Lighting is a T5HO 36” Nova extreme with one 39W TrueLumen Flora tube and one 39W TrueLumen 12,000K White. Lights run 12 hours. Filter is an Eheim Ecco 2236.
All other plants in the tank seem to be doing well. The tank houses mostly tetras, platties,a few dwarf sucker mouth Ottos, two Corys, a small clown Pleco and a large common Pleco,
I’ve heard that the plecos may be causing this damage. If it were just the leaf damage I would be inclined to believe it is the plecos scraping the leaves.
The first photo shows the new leaves, the leaf in the top center of the photo is about three weeks old. The other ones show the decay.
Any ideas??? Also, there isn't any CO2 in the tank as of now.