I have the following questions for you:
1) How old is this setup?
2) Did you use some sort of soil substrate? If yes specify which type
3) Did you pour the water directly on the substrate without doing it slowly and over time?
4) Did you cycle the tank beforehand?
5) Take a sample of the water and do a visual check on it. Does it look green?
Answer these questions and it'll be easier to give you a solution to the problem. I suspect it's a problem of green algae, or just dirt particles from the substrate suspended in the water.
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