Hi Freddy,
Actually green water can be solved without using a UV light. I once had a bad case of green water and no matter how many water changes I made I couldn't get rid of it.
A friend told me I can put live daphnia into my tank. The daphnia will comsume the plankton ( if I remember correctly) and can also be a food source for the fishes. But the downside is that you need a lot of daphnia for this method to work.
Another method is to black-out the whole tank. Cover it with a blanket or something and do not turn on the lights for about 3 days. The water should be clear by then and all you have to do is wash the filter media and do a water change. Hope this methods are useful.
Night gathers, and now my watch begins. It shall not end until my death. I shall take no wife, hold no lands, father no children. I shall wear no crowns and win no glory. I shall live and die at my post. I am the sword in the darkness. I am the watcher on the walls. I am the fire that burns against the cold, the light that brings the dawn, the horn that wakes the sleepers, the shield that guards the realms of men. I pledge my life and honor to the Night's Watch, for this night and all the nights to come.
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