How long has your tank been set up? If you just started that tank, you're tank is cycling and your ammonia and/or nitrite levels may be elavated. Can you post your ammonia, nitrite, and nitrate levels? That will help out a lot in determining what might be going on in your tank.
If your nitrate level is at zero, you may be having a mini cycle. Cloudy water may indicate a bacterial bloom. What have you done differently lately? Have you added fish, or possibly "extra cleaned" the tank?
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