When to use . Green water algae caused by over feeding and fish waste is unsightly in an aquarium, and can be dangerous as it may alter the ph and oxygen levels. Algae gone is a single-dose, plant-friendly treatment that will clarify the green or cloudy water in your aquarium. It works by clumping the minute particles together enabling your filter to strain them out.. Algae gone will also help to lower algae- causing phosphate, thereby promoting a healthier aquatic environment. Use when the water has become green or cloudy.. How to use . Calculate the volume of your aquarium in litres length x width x depth in cm 1,000 .. Shake the bottle thoroughly before use.. Mix required dose of treatment with 1 litre of aquarium water.. Add slowly to aquarium.. Warning:. Keep your aquarium away from direct sunlight and test your water for algae-fertilising nitrate using nt labs test kits.. Faqs:. Q: how does algae gone kill algae a: technically, algae gone is not an algaecide so it won't kill algae immediately like a weed killer would on your unwanted garden plants. Instead, algae gone causes the particles of the single-celled algae, which cause green water, to clump together, allowing you to manually remove them from the water column or the filter. As a secondary effect, algae gone will remove phosphate from the water which the algae would previously feed off, starving the algae with repeated use.. Q: how long will algae gone take to clear my aquarium a: this is impossible to say....