
Shoreweed
Littorella uniflora
Plantaginaceae

Littorella uniflora
Plantaginaceae
Lives wild in Austria, Baltic States, Belgium, Czechoslovakia, Denmark, Faroe Islands, Finland, France, and 15 more countries.
Littorella uniflora (vernacular name: (American) shoreweed) is a species of aquatic flowering plant native to the Azores, Morocco, most of Europe excluding the dry southeast, Iceland, and the Faroes. It prefers to live mostly submerged in nutrient-poor freshwater habitats. When submerged, it draws CO2 mostly through its roots and uses a mix of crassulacean acid metabolism (CAM) and C3 carbon fixation for photosynthesis. If the water level drops and exposes the roots, it ceases using CAM.
Two aquariums from Southeast Asia: calm forest streams and peat swamps with soft, brown water, and fast mountain streams with cool, oxygen-rich water.
A coldwater aquarium with European fish and plants, without a heater. The water follows the seasons, and summer heat is the biggest problem.
Light, nutrients and CO₂ in balance, low tech versus high tech, and how to read from the leaves what your plants are missing.