Use BIO VERT to remedy poor plant growth and yellowing, splitting or transparent foliage. BIO VERT provides all the trace elements your plants need for strong and healthy growth, including directly assailable iron. BIO VERT contains no nitrates or phosphates. The aquarium should be lighted 10 to 12 hours per day. A quarter of the water should be changed every month. The lighting tubes changed every year. Instructions: One capsule per 200 liters every two weeks. Keep away from children. Avoid contact with skin and eyes.