Live plants and live fish just go together. Try some Java Moss, just tie it to a decoration or piece of rock with some fishing line and sit back and see what happens. You might surprise yourself and get the plant bug. Don't try to plant up the tank in one go, just add one at a time and see which is easiest. Java Fern is also a good starter, it too needs trying to an rock or wood (don't plant it in the sand as it will rot).
Keeping aquatic plants is very different to non-aquatic plants - you never need to water them ! ?
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