Carbon dioxide is an essential element for plants and in particular for their structure. In an aquarium environment carbon dioxide is in part produced by the fish, which however is an insufficient quantity for the plants, and more specifically for the foliage or « greenery » which is normally a predominate feature in an ornamental aquarium. These effervescent CO2 Plant tablets not only release carbon dioxide in the water, but other nutritional substances for stimulating a lush plant growth, an important advantage over the use of CO2 bottles which only release carbon dioxide. These CO2 Plant tablets are quick dissolving (approx. 10-15 sec.) and do not leave traces of excipients as the substances contained in the tablets act as the reaction medium and are absorbed rapidly by the plants.