APT s/Sky by 2HR Aquarist is a water conditioner that allows aquatic plants to thrive regardless of the hardness of the water. It also favours the cultivation of shrimps in soft water. s/Sky contains an optimal blend of soluble calcium and magnesium salts, trace elements and seaweed extract in a uniform mixture. This blend is safe and non-toxic to aquatic life and is readily soluble in water. With APT s/Sky, the general water hardness in the aquarium can be adjusted exactly to the needs of the inhabitants and aquatic plants, so that all inhabitants are comfortable. APT s/Sky adjusts the GH-value in the aquarium without having a negative effect on the NPK, KH-value and pH-value. At the same time, a balanced amount of necessary minerals, such as calcium, magnesium, iron and trace elements, is introduced into the tank for an optimal GH-value.