That tank looks Radioactive!
I'd like to see those Zoa's with "white" lighting.
You're going to have to find a new home for that Lettuce, once it mows down your algea, it will starve. It won't look like it at first, but you will start to notice it shrinking as it does.
I don't think in a tank that small you will be able to keep up with it's need for food.