So I just installed a 20 gallon tank in my room. The water is crystal clear and it beautiful. The thing is, I want a background to go behind the aquarium so you can't see the wires. I have black gravel in the tank, right now that is all. I going out to get plants and a vertical structure to put inside before adding fish. What color plant and background do you suggest I get that will make it look good with the black gravel. Thanks.