Plants on the right will get bigger... Water sprite? Some kind of sword? Anyway, I would split up the plant clumps, personally. Especially the hairgrass (if not a checkered pattern to fill in, at least make a line versus a big ol' tuft, lol) & that Zealand? plant.
Indian fern? Hm, I'm thinking African water fern...(comes back from googling) Oh, water sprite! :laugh: yeah good floaty plant. What's the right side plant then? Wisteria/hygro difformis?