Beauty! The carpet is of glossostigma yes. In these aquas to the sun the ideal normally, after stabilized the tank, is to make two partial water exchanges weekly to leave the excesses of nutrients, or consequentemente the result one will be the green water (plâncton), or the seaweed, with certainty! These exchanges also will depend on the efficiency of absorption for the plants and/or carpet used in absorbing the luminosity and solar(sun) irradiation. For example: The Hemianthus micrantenoides a very useful carpet is extremamentes efficient in this function forming in the tanks to the sun, is incredible when the sun beats to fort in the tank the water of the tank is seeming a gaseous mineral water, with hundreds of microbubbles.