It's a start.
Probably could use a little more.
When I buy water plants, I buy them by their shape, on the premise that building a water garden is similar to composing a painting. It should look balanced, with form and texture providing visual depth. It should be a miniature landscape that has hidden corners and surprises that reveal themselves from each viewpoint. Not only does this prodice visual relief, but it offers various frogs, insects, and the occasional wild creature a protected spot to take a drink.
When building your water garden, remember: color, shape, form. Build a background or a center, then layer the plant heights around that.
Sometimes, it's obvious what goes where, and sometimes it's necessary to sit and contemplate it.
That's called taking a break, and a water garden is the perfect place for that.
(And for curiousity's sake, did you know wasps land, then walk up to the water and lean forward to drink, almost standing on their heads?)
And a certain understanding that the canna will grow diagonally if it so chooses, and the Boston fern will grow as large as it feels like, even if it hides the top of the fountain.