I have a ten gallon tank, filtered and heated, with a single male betta. I tried to plant wisteria in it, but I had immense difficulty burying it in substrate. They died after I went on vacation and the lights were turned off. I had them for a grand total of two weeks. My tank has gravel instead of soil. I'm thinking of adding either mopani wood or some other kind, and tying some plants to it. My light is a national geographic 20 inch led. What plants are easy and don't require much light and care?