Limited to 1 set: Blue Floating Plants, 15cm x 15cm square

My tropical fish are suffering due to the explosive growth, so I'm listing them for sale!

Shipping for those in the Kanto region will be on Mondays and Tuesdays.
For those outside the Kanto region, or in Kanto but on remote islands, shipping will be on Mondays. Depending on the temperature and your location, we may need to discuss the shipping date. This is to prevent the plants from dying during transit, so we appreciate your cooperation.

I grow aquatic plants in my aquarium, but they've grown too much, so I'm listing them for sale!
When I purchased the aquatic plants, some duckweed seemed to have attached itself, and it has been multiplying rapidly.
I have a 60cm aquarium for tropical fish, but the duckweed has completely covered the surface. Honestly, the fish are suffering, so I'd like to give it to someone who needs it.
There are no snails or shellfish in the aquarium.
I have about 5 types of shrimp and tropical fish, but they don't seem interested in the duckweed and it remains almost unharmed.

Each plant is about 2-3mm.
I will scoop out about 15cm x 15cm of floating duckweed and pack it for shipping. This is roughly equivalent to one ladleful (Otama) for home cooking, or one bowl of soup from a high-end restaurant.
Shipping will be via the 4th Class Mail service. During periods when seedlings are vulnerable, I will hand-deliver them to the post office to ensure they are kept there until shipping, rather than being placed in a mailbox.
I cannot guarantee against seedlings arriving dead, but I will include a little extra. If you are concerned about the temperature, you can upgrade to Mercari delivery for an additional 150 yen, which offers relatively faster shipping.
If you would like Mercari delivery, please contact me in the comments section (*^^*)?
Also, during the dormant period for seedlings, I will increase the price by adding a zero to the listing price. I will return it to 300 yen as soon as seedlings are secured.

Would this be useful for anyone looking to create a biotope or for goldfish and medaka spawning?