Anubias are not true aquatic plants and don't grow to their full potential when kept underwater. Get them if you like but I don't like them in aquariums.They are much better grown in a pot by a window or under a tree.
Some good plants to try include Ambulia, Hygrophila polysperma and ruba/ rubra, Elodia/ Hydrilla, Ludwigia, narrow Vallis, common Amazon Sword plant, and Water Sprite (Ceratopteris thalictroides/ cornuta).
Water Sprite is a floating plant but can also be grown in the substrate. the other plants should be planted in the gravel. Anubias should be tied to some wood or rock where they will attach to and grow slowly.
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How much light is on the tank and how long is it on for?
Some plants like Ambulia and Hygrophila sp will close their leaves up when they have had enough light. The top set of leaves will close up against each other and then the next set closes up against the stem and so on down the plant. Leave the light on for about 1 hour after the top few sets of leaves have closed up against the stem, then turn it off.