my first waterfall tank. what is it missing?

i’ve been letting my waterfall grow in for a few weeks. the fittonia has grown in and it’s looking good, but i still feel like this tank is missing something. the fact that the water tube is visible isn’t too annoying to me yet. i don’t like the look of faux rocks and didn’t want to deal with foam. are there any good non- foam methods to hide the tube?

thank you alll