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Einer der wichtigsten Pflanzennährstoffe im Aquarium ist Kohlendioxid, CO2.
Alle Pflanzen brauchen zum Wachstum und zum Leben Kohlendioxyd. Sie produzieren aus CO2, Wasser und Licht ihren wichtigsten Baustoff und Energieträger: Zucker.
Als „Abfallstoff“ entsteht Sauerstoff, den alle Tiere zum Atmen benötigen. Dieser Prozess – die sogenannte Photosynthese – ist die Grundlage für alles Leben auf unserer Erde.
Das Gas CO2 wird umgangssprachlich oft ungenau als Kohlensäure bezeichnet. Tatsächlich wird in der Wasserchemie gelöstes CO2 mit der eigentlichen Säure H2CO3 üblicherweise als „freie Kohlensäure“ zusammengefasst.
Während die meisten anderen pflanzenwichtigen Nährstoffe durch Zugabe von Bodengrund- oder Flüssigdünger bequem ergänzt werden können, brauchen wir für CO2 eine Apparatur.
Dabei reicht das Angebot im Fachhandel von klein bis gross, sowie von preiswert bis aufwändig. Die Bedeutung der CO2-Zugabe wird oft unterschätzt, denn mit einem stärkeren Pflanzenwachstum reduzieren wir auch die schädlichen Inhaltsstoffe des Aquarienwassers, angefangen von Schwermetallen wie Kupfer bis hin zu den unvermeidlichen durch die Abbauprozesse im Filter und Bodengrund anfallenden Nitrationen.
Guter Pflanzenwuchs = keine Algen
In Aquarien mit gut wachsenden Wasserpflanzen haben die lästigen Algen praktisch keine Chance. Algenfördernde Nährstoffe wie Phosphate und Nitrate werden von den Pflanzen sofort „absorbiert“. Fehlt jedoch CO2, kommt der Pflanzenwuchs ins Stocken. Überschüssige Nährstoffe werden nicht mehr schnell genug verbraucht. Jetzt haben die Algen ihre Chance, denn sie kommen bereits mit geringsten CO2 Mengen aus.
Eine gute Bepflanzung und regelmäßige CO2 Düngung gehören deshalb zu den wichtigsten vorbeugenden Maßnahmen gegen Algen.
Gutes Pflanzenwachstum ist Ausdruck für ein gesundes Aquarium – leichter geht’s mit CO2 und davon benötigt eine Pflanze ungefähr 20mg/l.
Siehe Dennerle CO2 Tabelle:
So nutzen sie die Tabelle:
Die grün markierten Werte sind optimal für gesunden, kräftigen Pflanzenwuchs.
Messen Sie die Karbonathärte, z. B. 5 °dH und suchen Sie einen mittleren CO2-Wert (grüner Bereich), z. B. 20 mg/l. Dann können Sie oben den zugehörigen pH-Wert 6,9 ablesen.