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 deficiency of phosphate in relation to the amount of nitrate often results in the growth of green filamentous algae. HS aqua Balance PO4 increases the phosphate level so that the plants can win the battle against the algae again.