Suitable for tanks from approx. 50 - 250 litres Inhibits green algae Only for freshwater tanks Including electrode Improves waterplant growth Twinstar inhibits green algae effectively without a harmful influence on aquarium ecological environment, and keeps aquarium clean by eliminating spores from the initial propagation.Sterilizing factor with microbubbles destroy cell wall of green algae to inhibit growth, and it is nontoxic so harmless to aerobic bacteria. Promoting aquatic plants growth by inhibition of green algae on plants, those plants can elevate absorption of excess nutrients to block nourishment of green algae growth. Therefore it makes Virtuous Cycle ecological environment.Twinstar promotes plants growth up to 50% at the most. It increases the amount of light on the surface of plants by inhibiting algae from the beginning. Also it activates microelements in water to help to take nourishment. With three different modes for different tank sizes Suitable for tanks from approx. 50 up to 250 litres 3 modes of operation Cable length from the electrode to the control unit 60 cm Twinstar is nontoxic so harmless to aerobic bacteria, fish and invertebrates