Azolla water fern are one of my favorite plants. Theyfix oxygen and keep the water underneath fresh.
Indtead I’ve got a great dying. I managed to keep them alive and thriving for 14 months, through moving house, twice changing water, mud, and water again. Now all dead and brown, I don’t know why.
Too cold? Not enough light? Water poisoned somehow? Fish nibbling on the roots? Only two fish remain and they are carniverous. It’s a mystery.
The chickweed are doing very well, thank you.
Rita de Heer 