Help!! Please

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MarkAshlee2021

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I have recently had green film algae on my aquarium glass so today I cleaned it all off and did a 50 litre water change (tank is 300 litres) 6 hours later the glass is green again!!! I have a uv filter also. Why is this happening?? Thank you in advance
 
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Azedenkae

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I have recently had green film algae on my aquarium glass so today I cleaned it all off and did a 50 litre water change (tank is 300 litres) 6 hours later the glass is green again!!! I have a uv filter also. Why is this happening?? Thank you in advance
Algae floats around in water, and so long as there is just a bit left that can get on the glass and there are plenty of nutrients, the algae would reproduce super quickly and cover the glass again.
 

Pistondog

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I have recently had green film algae on my aquarium glass so today I cleaned it all off and did a 50 litre water change (tank is 300 litres) 6 hours later the glass is green again!!! I have a uv filter also. Why is this happening?? Thank you in advance
What are your nutrient levels, is the tank near a window, in sun?
 
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MarkAshlee2021

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Algae floats around in water, and so long as there is just a bit left that can get on the glass and there are plenty of nutrients, the algae would reproduce super quickly and cover the glass again.
Thanks for replying, how can i get rid of it? And will it kill my corals and fish, before I cleaned the glass the water behind it was crystal clear. I don't get it. Thanks
 
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Azedenkae

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Thanks for replying, how can i get rid of it? And will it kill my corals and fish, before I cleaned the glass the water behind it was crystal clear. I don't get it. Thanks
No it won't kill corals unless it get so bad it smothers the corals. It may outcompete corals for nutrients though. Water was clear because the algae was on the glass, when you cleaned the glass the algae would go into the water.
 
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CMMorgan

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What are your phosphates? What is the flow rate on that UV? What is your PH?
If you have one, close the blind on that window and see if that helps. I tend to get more algae on the window side of my tank, even though it is indirect light. How often are you changing the socks?
 
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