So cute! Also very educational. I didn't realize how many different types of floating plants there were, or the difference between water lettuce and frogbit. I now know I have water lettuce, not frogbit. Bummer.
Though I am a little confused about the red root floaters. I have some of what I thought was giant duckweed, but it is quite red when grown under certain circumstances.
Maybe draw some of the non aquatics? People are always buying them. Add aluminum plant to the list. Though tbh, I have been growing it partially submerged for a while now. It was fully submerged and then it grew out of the water. Doing better than the one I have that is fully emerged. Obviously it only needs a leaf or two above water.
And last suggestion: bulb plants! Like water lilly, or others.
Remember that the tank your fish lives in is his or her's whole world. Ask yourself this question, and answer it honestly: would you choose to live there?