For a beautifully planted aquarium without algae growth, it is important that the water values ​​are in balance. In addition to a shortage of nutritional elements, an excess of an element can also cause algae growth. A shortage of nitrate in relation to a large amount of phosphate often results in the growth of blue-green algae. HS aqua Balance NO3 increases the nitrate content so that the plants can win the battle against the algae again.