Well, it appears the store mislabeled my "tiger lotus". It looks like a Madagascar lace plant without the holes, and it's skinnier and the leaves are a bit longer. Its leaves are also "wavy", and it's a bulb-type plant.
For some reason, it has these brown blotches that appear to becoming holes. The light is a Hagen FloraGro 2800K 20 watt. The tank also gets natural light from a window, and Tetra FloraGro once a month. All the others plants are healthy, except for this one.
What do you think the problem is?