Dear Adrian,
If it is bogwood/driftwood, then it should not cause cloudiness. However, for the first few weeks of placing wood in the tank (if the wood is relatively large), it is a good practice to change the water weekly (about 35%). This would dilute any new elements coming from the wood.
Cloudiness can be caused by the water flow (filter inlet/outlet position). Consider reducing the flow and reposition the outlet.
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