marine tank / cloudy water

Question
I have a 110lt marine tank that is approx 4 months old.

The levels of nitrate/nitrite etc are ok as is the ph level of 8.2

I have an eheim filter system that is large enough to handle a 200lt tank and an air stone.

The fish in the tank are a trigger/clown/file/tailfin and a wrasse.

I take out approx 15% of the tank evey two weeks or so and use a buffer to keep the levels constant.

Over the last 4 weeks or so the water has started to become cloudy and looks quite 'milky'. I have tried turning off the light for a few days and I have also added some 'cotton wool' to the filter to try and sift out the algea to no avail.



Any help or thoughts would be very welcome.



thanks David.  

Answer
use a carbon filter. it should remove contaminants. a filter bag filled with activated carbon placed in the water flow should help greatly. do a 40% water change. make sure the water parameters are the same as the tank. ph, temp, salinity, etc. change slowly.