A very large amazon sword! These are hardy plants and are great with most fish, even larger ones which would usually eat live plants.
Low - High light, CO2 and Nutrients are not necessary.
Medium growing speed, great for backgrounds.
Running plant, so stick the roots into the substrate.
The plant propagates by shooting runners from the plant.
Apologies to OP, I’m sure google would help too.
Just starting an outdoor fish pond/water fall feature. Would like to have some plants in and around the pond. Any recommendations for things available in Aus/Sydney?