Pandanus amarillifolius plant that I acquired 8 month ago is now officially "rooted". It took awhile for the plant to overcome dividing and its root system being sterilized with Clorox ® solution. Today, the plants are flourishing. By the way the leaves look and their growth rate, it seems that the plants are getting enough nutrients from the ranchu pond. Although, there is no significant effect on reduction of nitrates yet, I hope in the future as the plants get bigger and grow more roots, it will become noticeable. Just to remind, that the pandanus plants are suspended above the surface of water with their roots developing in the water with no substratum.
For now, it is an attractive addition to the pond and my ranchu seem to like to swim up to the roots and pick an algae growth from them. Oh, and did I mentioned that rice cooked with pandanus leaves tastes so much better!