I currently have a 60 gallon aquarium. It's 31" tall and each hexagon side is 12". The two bulbs that came with it are 8 watts each. Is that enough lighting for plant growth? I'm going to purchase plants this weekend, so I needed to know if that is even enough lighting for plants. I am thinking about getting water wisteria, Anacharis, java fern, or giant Hygrophilia. Also, sand is my substrate.