An Update on the 12 Litre Lucky Bamboo Aquarium

My second tech-free aquarium now has been running for about two weeks. During this period, green algae grew rapidly and soon had covered the sand and some of the plants. Due to this, I had to remove the java moss from the tank. Most of the algae have disappeared by now, though.
Unfortunately, the offshoots of umbrella papyrus did not grow well. I guess, the water level is too high for them. I decided to filter the tank by lucky bamboo exclusively, and added two more branches of it.

12 litre tank filtered by Dracaena sanderiana ('lucky bamboo').

A Second 12 Litre No-Tech Aquarium Follows

Only several weeks after I had decided to use some free space on my window ledge to install a tech-free aquarium, which is supposed to be filtered by the umbrella papyrus Cyperus alternifolius only, I've set up a second 12 litre tank directly next to it.