10 ml of Fluorum in 100 l (27 US gal) of water raises the fluorine level by 0.1 mg/l (ppm). It is important that each aquarium is different and the dosage depends on the coral cast and individual needs. Recommended level of fluorine in marine aquarium is 1.2 – 1.4 mg/l (ppm). Recommended dosage: 0.3 ml/100 l (27 US gal) of water daily Please remember, that maximum safe daily dose is 10 ml per 100 litres of water. If you need a higher dose, split it into a few days.