I second a sponge filter. It's such a simple, inexpensive, quiet item that will make the tank that much better. With a sponge filter some longfin white clouds would look very pretty. I have a very similar set up.
Now if that tank were in a window with more light, then you'd have lots more options for plants. I would consider moving the tank, but I know what it's like having limited sunny-window space.
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